{"id":95,"date":"2026-04-02T13:10:09","date_gmt":"2026-04-02T13:10:09","guid":{"rendered":"https:\/\/uptimerobot.com\/knowledge-hub\/?p=95"},"modified":"2026-04-02T13:10:10","modified_gmt":"2026-04-02T13:10:10","slug":"ssl-certificate-errors","status":"publish","type":"post","link":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/","title":{"rendered":"SSL Certificate Errors: A comprehensive guide"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">One bad certificate can trigger a browser warning, break secure connections, and make users question your site. Expired certs, name mismatches, broken chains, and protocol issues often look similar at first. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The hard part is mapping the warning to the exact cause before it turns into lost trust and support tickets.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide helps you identify common SSL certificate errors and match each one to the likely cause. You\u2019ll learn what to check first, whether the problem is client-side, and when your server setup needs attention. Then you can apply the right fix without guessing. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">fAfter that, SSL monitoring helps you catch expiry and configuration drift before users do.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">    <div class=\"wp-block-knowledge-hub-theme-intext-sidebar ur-intext-sidebar\">\n        <div class=\"widget-img\">\n            <img decoding=\"async\" src=\"https:\/\/uptimerobot.com\/knowledge-hub\/wp-content\/themes\/generatepress-child\/assets\/images\/img-intext-sidebar.png\" alt=\"UptimeRobot\">\n        <\/div>\n        <div class=\"widget-left\">\n            <div class=\"widget-title\">\n                <span>Downtime happens.<\/span>\n                <span class=\"text-primary\">Get notified!<\/span>\n            <\/div>\n            <div class=\"widget-text\">Join the world&#039;s leading uptime monitoring service with 3.2M+ happy users.<\/div>\n        <\/div>\n        <div class=\"widget-button\">\n            <a href=\"https:\/\/dashboard.uptimerobot.com\/sign-up?utm_source=uptimerobot&#038;utm_medium=kh&#038;utm_campaign=intext-sidebar\" class=\"button\">\n                <span>Register for FREE<\/span>\n            <\/a>\n        <\/div>\n    <\/div>\n    <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is an SSL error?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An SSL error is an issue that occurs when a browser is unable to establish a secure connection with a website due to problems with the website&#8217;s SSL certificate, such as it being expired, invalid, or improperly configured.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to fix SSL certificate errors<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fixing SSL certificate errors typically involves a combination of checking your certificate configuration, checking that it\u2019s up to date, and verifying your server settings are correct. Below are general troubleshooting steps that can help resolve SSL certificate errors:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Check SSL certificate validity:<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Make sure your SSL certificate hasn\u2019t expired. If it has, you\u2019ll need to renew it with your Certificate Authority (CA).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your certificate has been revoked, obtain a new one from a trusted CA.<\/p>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>Verify domain names:<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">See that the SSL certificate covers all domain names (with and without \u201cwww\u201d) and subdomains. For wildcard certificates, check if the correct subdomains are included.<\/p>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>Ensure proper installation:<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Check that the SSL certificate and any intermediate certificates are installed correctly on your server. Use tools like SSL Labs\u2019 SSL Test to check for configuration issues.<\/p>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li>Update SSL\/TLS protocols:<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Make sure your server supports the latest SSL\/TLS protocols (like TLS 1.2 or 1.3). Outdated versions (like SSL 3.0 or TLS 1.0) can trigger errors and should be disabled.<\/p>\n\n\n\n<ol start=\"5\" class=\"wp-block-list\">\n<li>Check server configuration:<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Verify that your server settings support SSL certificates. This includes enabling support for modern cipher suites and configuring the server to handle SSL connections correctly.<\/p>\n\n\n\n<ol start=\"6\" class=\"wp-block-list\">\n<li>Fix browser and system settings:<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Sometimes, the problem can be on the client side. Instruct users to update their browser, clear cache, or verify system settings like date and time, which can affect SSL connections.<\/p>\n\n\n\n<ol start=\"7\" class=\"wp-block-list\">\n<li>Review certificate chain:<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Check to see that your SSL certificate chain is complete, including the root and intermediate certificates. Missing links in the chain can trigger SSL errors on some browsers.<\/p>\n\n\n\n<ol start=\"8\" class=\"wp-block-list\">\n<li>Use automated monitoring tools:<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Use SSL monitoring services like UptimeRobot to keep track of certificate status, expiration dates, and potential issues in real-time. Automated alerts help you stay ahead of potential problems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A quick checklist for SSL certificate errors<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>When an SSL alert appears, start with the certificate itself. Check the expiration date, issuing CA, and revocation status. If any of those fail, renew or replace the certificate before looking deeper into server settings.<\/li>\n\n\n\n<li>Next, verify the hostname. The certificate should match every public hostname users can hit, including root, www, and any subdomains in scope. If the wrong certificate is being served, review redirects, virtual host settings, and SNI on shared servers.<\/li>\n\n\n\n<li>Then inspect the certificate chain. A valid leaf certificate can still fail if intermediate certificates are missing or installed in the wrong order. This is a fast check when browsers show trust errors or one browser fails while another works.<\/li>\n\n\n\n<li>After that, review protocol and cipher support. SSL and older TLS versions should be disabled, while TLS 1.2 and 1.3 should stay available. If the handshake still fails, compare client and server support, then check logs for mismatches, weak ciphers, or wrong ports.<\/li>\n\n\n\n<li>Finally, check the page itself. Mixed content warnings often come from scripts, images, fonts, or iframes still loading over HTTP. Update those resources to HTTPS and confirm third-party assets support secure delivery.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Once the issue is fixed, monitor renewal dates and retest after certificate changes. SSL errors often return after migrations, CDN changes, hosting moves, or redirect updates. A small monitoring loop helps catch them before visitors do.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SSL certificate errors<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SSL certificate errors can be a major roadblock in the seamless interaction we expect from the web.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They pop up when there&#8217;s a glitch in the secure connection between your browser and a website, signaling potential security risks or misconfigurations.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>TIP<\/strong>: Get alerted immediately when there&#8217;s an SSL error on your website.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-3e41869c wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/uptimerobot.com\/signUp?utm_source=uptimerobot.com&amp;utm_medium=blog&amp;utm_campaign=ssl-errors&amp;utm_content=uptimerobot\">Start Monitoring SSL Errors<\/a><\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">From the unsettling &#8220;Your connection is not private&#8221; warning to more cryptic messages about revoked certificates or protocol mismatches, these errors can confuse users and webmasters alike.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here are some of the most common SSL certificate errors, what triggers these errors, and what solutions you can implement to get you back on track to a secure, uninterrupted web experience.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">SSL certificate not trusted error (\u201dYour connection is not private\u201d)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This error occurs when your browser cannot verify the SSL certificate&#8217;s authenticity, essentially doubting the website&#8217;s security and confidentiality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Several factors can trigger this error, including an expired certificate, a certificate issued by an unrecognized CA, or a mismatch between the certificate and the domain name.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check the certificate&#8217;s validity <\/strong>to make sure the SSL certificate hasn&#8217;t expired. Website owners need to renew their certificates regularly to avoid this issue.<\/li>\n\n\n\n<li><strong>Use a trusted certificate authority<\/strong>: Browsers have a pre-installed list of trusted CAs, and certificates issued by unknown authorities will trigger this error.<\/li>\n\n\n\n<li><strong>Ensure correct certificate installation<\/strong>: Improperly installed certificates can cause this error. Website owners should verify the certificate installation process was completed correctly, ensuring all certificates, including intermediate certificates, are correctly installed.<\/li>\n\n\n\n<li><strong>Update your browser<\/strong>: Older versions of browsers might not recognize newer CAs or updated security standards.<\/li>\n\n\n\n<li><strong>Check your computer&#8217;s date and time<\/strong>: An incorrect system date and time can lead to SSL certificate errors.&nbsp;&nbsp;<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Name Mismatch Error<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The Name Mismatch Error comes up when the domain name listed on the SSL certificate does not match the domain name that the user is attempting to visit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This discrepancy raises a red flag for the browser, which then questions the legitimacy of the website&#8217;s identity, potentially exposing users to a man-in-the-middle attack or other security threats. Essentially, the browser is being cautious, ensuring you&#8217;re connecting to a genuine site and not a fraudulent one.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Verify the domain name:<\/strong> Website owners should first check the SSL certificate to confirm that the correct domain name is listed. If your site can be accessed both with and without the &#8216;www&#8217; prefix (for example, www.example.com and example.com), your SSL certificate should cover both versions. Certificates that cover multiple subdomains need to be specifically configured as wildcard certificates (e.g., *.example.com) or include multiple domain and subdomain names.<\/li>\n\n\n\n<li><strong>Update the SSL certificate:<\/strong> If the domain name on the certificate is incorrect, the only solution is to obtain a new SSL certificate that accurately reflects the domain name users will use to access the site.<\/li>\n\n\n\n<li><strong>Configure the server for the correct domain: <\/strong>Sometimes, the server might be configured to serve the same content across multiple domains, but the SSL certificate only covers one domain. Configuring the server to redirect all traffic to the domain name specified on the SSL certificate can resolve this issue.<\/li>\n\n\n\n<li><strong>Use Server Name Indication (SNI):<\/strong> For servers hosting multiple domains, SNI allows each domain to present its own SSL certificate, even if they share the same IP address. Ensure your server is configured to use SNI correctly.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">SSL Certificate Revoked Error<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The SSL Certificate Revoked Error is a critical security warning indicating that the SSL certificate the website is using has been invalidated by the issuing CA before its expiration date.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This can happen for several reasons, such as the certificate being compromised, the website no longer being considered secure, or the certificate being issued in error.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When a certificate is revoked, it&#8217;s a sign that the secure connection cannot be trusted, and browsers will prevent users from accessing the site to protect their privacy and security.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check certificate status:<\/strong> Website owners should immediately verify the revocation status of their SSL certificate through tools provided by their CA or through online SSL checking services.&nbsp;&nbsp;<\/li>\n\n\n\n<li><strong>Obtain a new SSL certificate:<\/strong> If the certificate has been revoked, the only solution is to obtain a new SSL certificate from a trusted CA. Before reissuing, it&#8217;s essential to address any security issues or compliance failures that led to the revocation to prevent future occurrences.<\/li>\n\n\n\n<li><strong>Use certificate transparency logs:<\/strong> Enabling Certificate Transparency for your new certificate can help monitor and quickly identify if a certificate is mistakenly or maliciously revoked, providing an extra layer of security and trustworthiness.<\/li>\n\n\n\n<li><strong>Update Certificate Revocation Lists (CRLs) and OCSP:<\/strong> Ensure your server correctly handles Certificate Revocation Lists and Online Certificate Status Protocol (OCSP) stapling. This not only improves the security but also the performance of SSL connections to your site.<\/li>\n\n\n\n<li><strong>Regularly monitor your certificates:<\/strong> Implement a regular monitoring process for your certificates&#8217; status. Early detection of potential issues can prevent revocation and the associated downtime and security risks.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Generic SSL Protocol Error<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A Generic SSL Protocol Error is a broad notification that indicates a problem with establishing a secure connection between the user&#8217;s browser and the website&#8217;s server.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This error can stem from a variety of issues, ranging from outdated SSL protocols or cipher suites, and server misconfigurations, to compatibility problems between the server and client.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike more specific SSL errors, this one doesn\u2019t pinpoint the exact cause, making it puzzling for both users and website administrators.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Update server SSL\/TLS protocols: <\/strong>Website owners should ensure their servers are configured to use the latest versions of SSL\/TLS protocols, such as TLS 1.2 or TLS 1.3. Older versions like SSL 3.0 and TLS 1.0 are outdated and more vulnerable to attacks, and their use can trigger this error.<\/li>\n\n\n\n<li><strong>Review server configuration:<\/strong> Check your server&#8217;s SSL configuration for any incorrect settings. Tools like SSL Labs&#8217; SSL Test can help evaluate your server&#8217;s SSL\/TLS setup and identify potential issues that could lead to generic SSL protocol errors.<\/li>\n\n\n\n<li><strong>Ensure compatibility: <\/strong>Make sure your server&#8217;s configuration is compatible with a wide range of browsers and devices, especially if you&#8217;re targeting a broad audience. This includes configuring the server to support a variety of cipher suites and fallback protocols.<\/li>\n\n\n\n<li><strong>Renew or replace SSL certificates:<\/strong> An expired, invalid, or improperly installed SSL certificate can cause generic SSL errors. Verify your certificate&#8217;s validity, ensure it&#8217;s correctly installed, and renew or replace it if necessary.<\/li>\n\n\n\n<li><strong>Consult logs and documentation:<\/strong> Server logs and browser error details can provide clues about the underlying cause of a generic SSL protocol error. Consult these resources for any specific error codes or messages that can guide your troubleshooting efforts.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Mixed Content Error<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A Mixed Content Error arises when a secure webpage (loaded over HTTPS) contains elements (such as images, videos, stylesheets, and scripts) that are loaded over an insecure HTTP connection.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This creates a security risk as the unsecured elements can potentially be tampered with or intercepted, undermining the security of the entire webpage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Browsers highlight this issue to users by displaying warnings or blocking the mixed content altogether, which can affect the functionality and user trust in a website.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Identify mixed content:<\/strong> Use tools like the browser&#8217;s developer console to identify the specific elements that are causing the mixed content error. These tools will list the resources loaded over HTTP.<\/li>\n\n\n\n<li><strong>Update content links:<\/strong> Manually check your webpage&#8217;s source code and update all HTTP links to HTTPS. This includes links to images, scripts, iframes, and any externally hosted resources.<\/li>\n\n\n\n<li><strong>Ensure absolute URLs use HTTPS: <\/strong>When linking to external resources or within your site, use absolute URLs that begin with https:\/\/. This ensures that the resources are always requested securely.<\/li>\n\n\n\n<li><strong>Configure server to redirect HTTP to HTTPS:<\/strong> Implement server-side redirects from HTTP to HTTPS for all requests. This measure automatically upgrades all requests to secure connections, preventing mixed content issues.<\/li>\n\n\n\n<li><strong>Use Content Security Policy (CSP)<\/strong>: Implement a Content Security Policy header to help detect and mitigate mixed content. A CSP can be configured to upgrade insecure requests automatically or report mixed content issues for further action.<\/li>\n\n\n\n<li><strong>Check third-party resources:<\/strong> Ensure that any third-party resources embedded in your site support HTTPS and update their URLs accordingly. If a resource does not support HTTPS, consider replacing it with a secure alternative.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Other SSL certificate errors<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">While the spotlight often shines on the most common SSL certificate errors, there&#8217;s a world of less familiar, yet equally critical errors that deserve our attention.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From encryption mismatches to legacy issues that stubbornly persist, understanding these errors is vital.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Exploring these hidden SSL hurdles and arming yourself with the tools to overcome them is essential for maintaining a secure and trustworthy online environment.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">ERR_SSL_VERSION_INTERFERENCE<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation<\/strong>: This error occurs due to a conflict between the SSL version the server uses and what the browser supports.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible Fixes: Try disabling TLS 1.3 in your browser settings, or update your server to support TLS 1.3.<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation<\/strong>: Indicates the server&#8217;s certificate chain does not include the pinned public key.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes: Ensure the server&#8217;s certificate chain includes the correct pinned public key.<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation<\/strong>: Indicates the server&#8217;s certificate chain does not include the pinned public key.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes: Ensure the server&#8217;s certificate chain includes the correct pinned public key.<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_ERROR_NO_CYPHER_OVERLAP<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> This error occurs when the client and server lack compatible encryption algorithms.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes: <\/strong>Check to see that both client and server support common ciphers, and update their configurations to include a wider range of encryption protocols.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_ERROR_RX_RECORD_TOO_LONG<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> This means there is a server-side misconfiguration during the SSL handshake.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes:<\/strong> Verify the server&#8217;s SSL\/TLS configuration and its SSL certificate, and make sure the right SSL port is used.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_ERROR_SYSCALL<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> A syscall error usually signifies a network issue or server-side problem during the SSL handshake.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes: <\/strong>Check the network stability and server configurations, and review server logs for detailed error messages.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_ERROR_BAD_CERT_DOMAIN<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation: <\/strong>The SSL certificate&#8217;s domain does not match the domain in the browser address bar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes:<\/strong> Check that the certificate is issued for the correct domain. Use a wildcard or SAN certificate for multiple domains.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_ERROR_INTERNAL_ERROR_ALERT<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation: <\/strong>This generic error means there is an internal server issue that has happened during the SSL handshake.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes: <\/strong>Check server logs for specific error messages, and double-check to see if the server\u2019s SSL configuration is correct, and that the certificate is valid.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_ERROR_31<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation: <\/strong>This is another generic error that can arise from various issues, including network problems or outdated software.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes:<\/strong> Update both client and server software and ensure proper network configurations.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_ERROR_61<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> This error occurs when the server&#8217;s SSL certificate is not trusted by the client.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes:<\/strong> Update the client\u2019s CA certificates, or obtain a certificate from a recognized certificate authority.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_CERTIFICATE_PROBLEM_UNABLE_TO_GET_LOCAL_ISSUER_CERTIFICATE<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Seeing this error means there is an incomplete certificate chain, making it impossible for the client to verify the SSL certificate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes<\/strong>: Ensure the server provides the full certificate chain, including intermediate certificates.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_ERROR_UNABLE_TO_VERIFY_THE_FIRST_CERTIFICATE<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> This error happens when the client can\u2019t verify the server&#8217;s root certificate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes: <\/strong>Add the correct root certificate to the client\u2019s trusted store.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_PROTOCOL_ERROR<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> This means a protocol mismatch between the client and server.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes:<\/strong> Update both client and server to support modern SSL\/TLS protocols, like TLS 1.2 or 1.3.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">SSL_HANDSHAKE_ERROR or SSL_HANDSHAKE_FAILURE_ALERT<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> SSL handshake between client and server has failed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible fixes:<\/strong> Review and ensure compatibility of configurations on both client and server sides, or check for issues with certificates and network connectivity.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">ERR_CERT_SYMANTEC_LEGACY<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation<\/strong>: This error occurs with certificates issued by Symantec before June 1, 2016, as they are no longer trusted by modern browsers.<strong>Possible fix<\/strong>: Website owners need to replace legacy Symantec certificates with new certificates from a trusted CA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fixing SSL errors usually involves checking configurations on both the client (your browser) and the server hosting the website. Sometimes, simply updating your browser or the server&#8217;s SSL\/TLS certificate resolves the issue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In more complex cases, digging into server settings or consulting with IT professionals might be necessary.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Error Name<\/strong><\/td><td><strong>Explanation<\/strong><\/td><\/tr><tr><td>ERR_SSL_VERSION_INTERFERENCE<\/td><td>This error occurs due to a conflict between the SSL version the server uses and what the browser supports.<\/td><\/tr><tr><td>ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN<\/td><td>Indicates the server\u2019s certificate chain does not include the pinned public key.<\/td><\/tr><tr><td>NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM<\/td><td>This error pops up when the certificate uses a weak signature algorithm that\u2019s not secure enough.<\/td><\/tr><tr><td>NET::ERR_CERT_AUTHORITY_INVALID<\/td><td>The certificate authority (CA) that issued the SSL certificate is not trusted by the browser.<\/td><\/tr><tr><td>NET::ERR_CERT_DATE_INVALID<\/td><td>The SSL certificate is either not yet valid or has expired.<\/td><\/tr><tr><td>NET::ERR_CERT_SYMANTEC_LEGACY<\/td><td>Certificates issued by Symantec before June 1, 2016, are no longer trusted.<\/td><\/tr><tr><td>ERR_CERT_COMMON_NAME_INVALID<\/td><td>The common name (CN) of the certificate does not match the requested host name.<\/td><\/tr><tr><td>NET::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED<\/td><td>The certificate does not meet Chrome\u2019s transparency requirements.<\/td><\/tr><tr><td>SEC_ERROR_UNKNOWN_ISSUER<\/td><td>The browser does not recognize the issuer of the certificate.<\/td><\/tr><tr><td>SSL_ERROR_RX_RECORD_TOO_LONG<\/td><td>This error typically means that the server is not properly configured for SSL.<\/td><\/tr><tr><td>ERR_SSL_BAD_RECORD_MAC_ALERT<\/td><td>This alert is often caused by a record that could not be decrypted properly.<\/td><\/tr><tr><td>SSL_ERROR_NO_CYPHER_OVERLAP<\/td><td>No common encryption algorithm(s) between the client and server.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to check your SSL certificate for errors<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Manually checking your SSL certificate is a straightforward process that can help catch errors and inconsistencies before they affect your users.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To start, you can visit your website using a web browser and click on the padlock icon in the address bar. This action brings up details about the site&#8217;s SSL certificate.&nbsp;<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw\" alt=\"How to check your SSL certificate for errors\"><\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXeuiUbZVdVaXA9GhnmqPHwuZ5LIa0o_pRdpwdmDFoZ7HE_rJVj_6l5N1c7m4OhlbRgxHf4G-Y-l55HgHoQCaVlpHbmQRH-Gvld6oWe4wmFVzj23n8zFn6Vl26Z5usTkr-tZy9MUhdRPuecuqn4mWTlmGH-B?key=Cl3xA4ifV3fEGthwvGbqYw\" alt=\"How to check your SSL certificate for errors\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, this manual approach can be time-consuming and might not catch every issue, especially for websites with multiple pages or subdomains, where each might use different certificates or configurations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a more thorough inspection, consider using online SSL checking tools that provide detailed reports about your certificate&#8217;s status, expiration date, and any potential misconfigurations or vulnerabilities.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">By integrating <a href=\"https:\/\/uptimerobot.com\/ssl-monitoring\/?utm_source=uptimerobot&amp;utm_medium=blog&amp;utm_campaign=ssl-errors&amp;utm_content=conclusion\">SSL monitoring<\/a> tools like UptimeRobot into your website\u2019s HTTPS monitoring setup, you can receive immediate alerts for any SSL-related errors.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This easy practice keeps you updated on important issues like certificate expiration, domain mismatches, outdated protocols, and approaching renewal deadlines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Staying vigilant with SSL monitoring and addressing potential errors promptly is a major part of maintaining a secure, trustworthy website that protects both your users and your reputation.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-3e41869c wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/dashboard.uptimerobot.com\/sign-up?utm_source=uptimerobot&amp;utm_medium=blog&amp;utm_campaign=ssl-errors&amp;utm_campaign=conclusion\">Start Monitoring SSL Certificates<\/a><\/div>\n<\/div>\n\n\n\n<div id=\"faq\" class=\"faq-block py-8 \">\n    \n    <ul class=\"faq-accordion\" data-faq-accordion>\n                    <li class=\"faq-accordion__item\">\n                <button \n                    class=\"faq-accordion__title\"\n                    type=\"button\"\n                    aria-expanded=\"false\"\n                    data-faq-trigger>\n                    <h3 id=\"what-usually-causes-an-ssl-certificate-error\" class=\"faq-accordion__question\">\n                        What usually causes an SSL certificate error?                    <\/h3>\n                    <span class=\"faq-accordion__icon\" aria-hidden=\"true\">+<\/span>\n                <\/button>\n                <div class=\"faq-accordion__content-wrapper\">\n                    <div class=\"faq-accordion__content\">\n                        <div class=\"faq-accordion__content-inner\">\n                            SSL certificate errors usually happen when a certificate is expired, issued for the wrong hostname, revoked, or installed with an incomplete certificate chain. You can also see them when the server is using outdated TLS settings or the browser cannot verify the issuing certificate authority. Start by checking the certificate dates, covered domains, and chain details.                        <\/div>\n                    <\/div>\n                <\/div>\n            <\/li>\n                    <li class=\"faq-accordion__item\">\n                <button \n                    class=\"faq-accordion__title\"\n                    type=\"button\"\n                    aria-expanded=\"false\"\n                    data-faq-trigger>\n                    <h3 id=\"why-do-users-see-your-connection-is-not-private-on-a-website\" class=\"faq-accordion__question\">\n                        Why do users see \u201cYour connection is not private\u201d on a website?                    <\/h3>\n                    <span class=\"faq-accordion__icon\" aria-hidden=\"true\">+<\/span>\n                <\/button>\n                <div class=\"faq-accordion__content-wrapper\">\n                    <div class=\"faq-accordion__content\">\n                        <div class=\"faq-accordion__content-inner\">\n                            This warning appears when the browser cannot trust the certificate presented by the site. Common reasons include an expired certificate, an unknown or untrusted certificate authority, or a hostname mismatch. The fastest fix is to verify the certificate\u2019s validity and confirm it matches the exact domain users are visiting.                        <\/div>\n                    <\/div>\n                <\/div>\n            <\/li>\n                    <li class=\"faq-accordion__item\">\n                <button \n                    class=\"faq-accordion__title\"\n                    type=\"button\"\n                    aria-expanded=\"false\"\n                    data-faq-trigger>\n                    <h3 id=\"what-does-a-name-mismatch-ssl-error-mean\" class=\"faq-accordion__question\">\n                        What does a name mismatch SSL error mean?                    <\/h3>\n                    <span class=\"faq-accordion__icon\" aria-hidden=\"true\">+<\/span>\n                <\/button>\n                <div class=\"faq-accordion__content-wrapper\">\n                    <div class=\"faq-accordion__content\">\n                        <div class=\"faq-accordion__content-inner\">\n                            A name mismatch error means the domain in the certificate does not match the domain in the browser address bar. For example, a certificate for <code>example.com<\/code> will not fully cover <code>app.example.com<\/code> unless that hostname is included. Check both the common name and subject alternative names before reissuing the certificate.                        <\/div>\n                    <\/div>\n                <\/div>\n            <\/li>\n                    <li class=\"faq-accordion__item\">\n                <button \n                    class=\"faq-accordion__title\"\n                    type=\"button\"\n                    aria-expanded=\"false\"\n                    data-faq-trigger>\n                    <h3 id=\"can-a-site-have-a-valid-certificate-and-still-show-ssl-errors\" class=\"faq-accordion__question\">\n                        Can a site have a valid certificate and still show SSL errors?                    <\/h3>\n                    <span class=\"faq-accordion__icon\" aria-hidden=\"true\">+<\/span>\n                <\/button>\n                <div class=\"faq-accordion__content-wrapper\">\n                    <div class=\"faq-accordion__content\">\n                        <div class=\"faq-accordion__content-inner\">\n                            Yes, a certificate can be valid but still fail because of an incomplete intermediate chain, incorrect server configuration, or unsupported TLS settings. In that case, the problem is not the expiration date but how the certificate is served. Review the full chain and test the server configuration from an external checker.                        <\/div>\n                    <\/div>\n                <\/div>\n            <\/li>\n                    <li class=\"faq-accordion__item\">\n                <button \n                    class=\"faq-accordion__title\"\n                    type=\"button\"\n                    aria-expanded=\"false\"\n                    data-faq-trigger>\n                    <h3 id=\"what-is-the-difference-between-an-ssl-certificate-error-and-an-ssl-protocol-error\" class=\"faq-accordion__question\">\n                        What is the difference between an SSL certificate error and an SSL protocol error?                    <\/h3>\n                    <span class=\"faq-accordion__icon\" aria-hidden=\"true\">+<\/span>\n                <\/button>\n                <div class=\"faq-accordion__content-wrapper\">\n                    <div class=\"faq-accordion__content\">\n                        <div class=\"faq-accordion__content-inner\">\n                            An SSL certificate error is tied to the certificate itself, such as trust, expiration, or domain coverage. An SSL protocol error usually points to a handshake or configuration problem, such as disabled TLS versions, incompatible cipher suites, or a broken server setup. That difference matters because renewing the certificate will not fix a protocol-level issue by itself.                        <\/div>\n                    <\/div>\n                <\/div>\n            <\/li>\n                    <li class=\"faq-accordion__item\">\n                <button \n                    class=\"faq-accordion__title\"\n                    type=\"button\"\n                    aria-expanded=\"false\"\n                    data-faq-trigger>\n                    <h3 id=\"what-should-i-do-after-fixing-an-ssl-certificate-issue\" class=\"faq-accordion__question\">\n                        What should I do after fixing an SSL certificate issue?                    <\/h3>\n                    <span class=\"faq-accordion__icon\" aria-hidden=\"true\">+<\/span>\n                <\/button>\n                <div class=\"faq-accordion__content-wrapper\">\n                    <div class=\"faq-accordion__content\">\n                        <div class=\"faq-accordion__content-inner\">\n                            After the error is resolved, set up recurring checks for certificate expiry, domain coverage, and TLS availability so the same problem does not return unnoticed. It also helps to document renewal ownership and alerting before the next expiration window. That turns SSL from a one-time fix into a repeatable monitoring workflow.                        <\/div>\n                    <\/div>\n                <\/div>\n            <\/li>\n            <\/ul>\n<\/div>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What usually causes an SSL certificate error?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"SSL certificate errors usually happen when a certificate is expired, issued for the wrong hostname, revoked, or installed with an incomplete certificate chain. You can also see them when the server is using outdated TLS settings or the browser cannot verify the issuing certificate authority. Start by checking the certificate dates, covered domains, and chain details.\"}},{\"@type\":\"Question\",\"name\":\"Why do users see \u201cYour connection is not private\u201d on a website?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This warning appears when the browser cannot trust the certificate presented by the site. Common reasons include an expired certificate, an unknown or untrusted certificate authority, or a hostname mismatch. The fastest fix is to verify the certificate\u2019s validity and confirm it matches the exact domain users are visiting.\"}},{\"@type\":\"Question\",\"name\":\"What does a name mismatch SSL error mean?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A name mismatch error means the domain in the certificate does not match the domain in the browser address bar. For example, a certificate for example.com will not fully cover app.example.com unless that hostname is included. Check both the common name and subject alternative names before reissuing the certificate.\"}},{\"@type\":\"Question\",\"name\":\"Can a site have a valid certificate and still show SSL errors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a certificate can be valid but still fail because of an incomplete intermediate chain, incorrect server configuration, or unsupported TLS settings. In that case, the problem is not the expiration date but how the certificate is served. Review the full chain and test the server configuration from an external checker.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between an SSL certificate error and an SSL protocol error?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An SSL certificate error is tied to the certificate itself, such as trust, expiration, or domain coverage. An SSL protocol error usually points to a handshake or configuration problem, such as disabled TLS versions, incompatible cipher suites, or a broken server setup. That difference matters because renewing the certificate will not fix a protocol-level issue by itself.\"}},{\"@type\":\"Question\",\"name\":\"What should I do after fixing an SSL certificate issue?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"After the error is resolved, set up recurring checks for certificate expiry, domain coverage, and TLS availability so the same problem does not return unnoticed. It also helps to document renewal ownership and alerting before the next expiration window. That turns SSL from a one-time fix into a repeatable monitoring workflow.\"}}]}<\/script>\n","protected":false},"excerpt":{"rendered":"<p>One bad certificate can trigger a browser warning, break secure connections, and make users question your site. Expired certs, name mismatches, broken chains, and protocol issues often look similar at first. The hard part is mapping the warning to the exact cause before it turns into lost trust and support tickets. This guide helps you [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-95","post","type-post","status-publish","format-standard","hentry","category-monitoring"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SSL Certificate Errors: Causes, Fixes &amp; Monitoring Tips - UptimeRobot Knowledge Hub<\/title>\n<meta name=\"description\" content=\"SSL certificate errors explained: common causes, how to fix them, and how to monitor expirations and issues before they cause downtime.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SSL Certificate Errors: Causes, Fixes &amp; Monitoring Tips - UptimeRobot Knowledge Hub\" \/>\n<meta property=\"og:description\" content=\"SSL certificate errors explained: common causes, how to fix them, and how to monitor expirations and issues before they cause downtime.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/\" \/>\n<meta property=\"og:site_name\" content=\"UptimeRobot Knowledge Hub\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-02T13:10:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-02T13:10:10+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw\" \/>\n<meta name=\"author\" content=\"Laura Clayton\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Laura Clayton\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"14 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/\"},\"author\":{\"name\":\"Laura Clayton\",\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/#\\\/schema\\\/person\\\/c05598f15bcbd26ed4d53240dff2ae34\"},\"headline\":\"SSL Certificate Errors: A comprehensive guide\",\"datePublished\":\"2026-04-02T13:10:09+00:00\",\"dateModified\":\"2026-04-02T13:10:10+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/\"},\"wordCount\":3213,\"publisher\":{\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/lh7-rt.googleusercontent.com\\\/docsz\\\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw\",\"articleSection\":[\"Monitoring\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/\",\"url\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/\",\"name\":\"SSL Certificate Errors: Causes, Fixes & Monitoring Tips - UptimeRobot Knowledge Hub\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/lh7-rt.googleusercontent.com\\\/docsz\\\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw\",\"datePublished\":\"2026-04-02T13:10:09+00:00\",\"dateModified\":\"2026-04-02T13:10:10+00:00\",\"description\":\"SSL certificate errors explained: common causes, how to fix them, and how to monitor expirations and issues before they cause downtime.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/#primaryimage\",\"url\":\"https:\\\/\\\/lh7-rt.googleusercontent.com\\\/docsz\\\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw\",\"contentUrl\":\"https:\\\/\\\/lh7-rt.googleusercontent.com\\\/docsz\\\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/ssl-certificate-errors\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Knowledge Hub\",\"item\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Monitoring\",\"item\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/monitoring\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"SSL Certificate Errors: A comprehensive guide\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/#website\",\"url\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/\",\"name\":\"UptimeRobot Knowledge Hub\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/#organization\",\"name\":\"UptimeRobot Knowledge Hub\",\"url\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/wp-content\\\/uploads\\\/2024\\\/04\\\/cropped-knowledge-hub-logo.png\",\"contentUrl\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/wp-content\\\/uploads\\\/2024\\\/04\\\/cropped-knowledge-hub-logo.png\",\"width\":2000,\"height\":278,\"caption\":\"UptimeRobot Knowledge Hub\"},\"image\":{\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/#\\\/schema\\\/person\\\/c05598f15bcbd26ed4d53240dff2ae34\",\"name\":\"Laura Clayton\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/wp-content\\\/uploads\\\/2024\\\/04\\\/laura_clayton-150x150.jpeg\",\"url\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/wp-content\\\/uploads\\\/2024\\\/04\\\/laura_clayton-150x150.jpeg\",\"contentUrl\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/wp-content\\\/uploads\\\/2024\\\/04\\\/laura_clayton-150x150.jpeg\",\"caption\":\"Laura Clayton\"},\"description\":\"Laura Clayton has over a decade of experience in the tech industry, she brings a wealth of knowledge and insights to her articles, helping businesses maintain optimal online performance. Laura's passion for technology drives her to explore the latest in monitoring tools and techniques, making her a trusted voice in the field.\",\"sameAs\":[\"https:\\\/\\\/www.linkedin.com\\\/in\\\/laura-clayton-b00a4aa4\\\/\"],\"url\":\"https:\\\/\\\/uptimerobot.com\\\/knowledge-hub\\\/author\\\/laura\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"SSL Certificate Errors: Causes, Fixes & Monitoring Tips - UptimeRobot Knowledge Hub","description":"SSL certificate errors explained: common causes, how to fix them, and how to monitor expirations and issues before they cause downtime.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/","og_locale":"en_US","og_type":"article","og_title":"SSL Certificate Errors: Causes, Fixes & Monitoring Tips - UptimeRobot Knowledge Hub","og_description":"SSL certificate errors explained: common causes, how to fix them, and how to monitor expirations and issues before they cause downtime.","og_url":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/","og_site_name":"UptimeRobot Knowledge Hub","article_published_time":"2026-04-02T13:10:09+00:00","article_modified_time":"2026-04-02T13:10:10+00:00","og_image":[{"url":"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw","type":"","width":"","height":""}],"author":"Laura Clayton","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Laura Clayton","Est. reading time":"14 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/#article","isPartOf":{"@id":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/"},"author":{"name":"Laura Clayton","@id":"https:\/\/uptimerobot.com\/knowledge-hub\/#\/schema\/person\/c05598f15bcbd26ed4d53240dff2ae34"},"headline":"SSL Certificate Errors: A comprehensive guide","datePublished":"2026-04-02T13:10:09+00:00","dateModified":"2026-04-02T13:10:10+00:00","mainEntityOfPage":{"@id":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/"},"wordCount":3213,"publisher":{"@id":"https:\/\/uptimerobot.com\/knowledge-hub\/#organization"},"image":{"@id":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/#primaryimage"},"thumbnailUrl":"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw","articleSection":["Monitoring"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/","url":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/","name":"SSL Certificate Errors: Causes, Fixes & Monitoring Tips - UptimeRobot Knowledge Hub","isPartOf":{"@id":"https:\/\/uptimerobot.com\/knowledge-hub\/#website"},"primaryImageOfPage":{"@id":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/#primaryimage"},"image":{"@id":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/#primaryimage"},"thumbnailUrl":"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw","datePublished":"2026-04-02T13:10:09+00:00","dateModified":"2026-04-02T13:10:10+00:00","description":"SSL certificate errors explained: common causes, how to fix them, and how to monitor expirations and issues before they cause downtime.","breadcrumb":{"@id":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/#primaryimage","url":"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw","contentUrl":"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXed6EzzLCgr-Tsm4Ut_R6MOb--g8L2vVDiDOaa9K1dkBMkMIjpzoInNR8d_1DvWNPWXwdPjPQYxH1FgbUPkvAVQRaXM3i2fj-CVPcjDasE_RCTX6jDLMTqL6bBSocTojaV44j_BfhIS-ciCCJZsf8RT0M3P?key=Cl3xA4ifV3fEGthwvGbqYw"},{"@type":"BreadcrumbList","@id":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/ssl-certificate-errors\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Knowledge Hub","item":"https:\/\/uptimerobot.com\/knowledge-hub\/"},{"@type":"ListItem","position":2,"name":"Monitoring","item":"https:\/\/uptimerobot.com\/knowledge-hub\/monitoring\/"},{"@type":"ListItem","position":3,"name":"SSL Certificate Errors: A comprehensive guide"}]},{"@type":"WebSite","@id":"https:\/\/uptimerobot.com\/knowledge-hub\/#website","url":"https:\/\/uptimerobot.com\/knowledge-hub\/","name":"UptimeRobot Knowledge Hub","description":"","publisher":{"@id":"https:\/\/uptimerobot.com\/knowledge-hub\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/uptimerobot.com\/knowledge-hub\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/uptimerobot.com\/knowledge-hub\/#organization","name":"UptimeRobot Knowledge Hub","url":"https:\/\/uptimerobot.com\/knowledge-hub\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/uptimerobot.com\/knowledge-hub\/#\/schema\/logo\/image\/","url":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-content\/uploads\/2024\/04\/cropped-knowledge-hub-logo.png","contentUrl":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-content\/uploads\/2024\/04\/cropped-knowledge-hub-logo.png","width":2000,"height":278,"caption":"UptimeRobot Knowledge Hub"},"image":{"@id":"https:\/\/uptimerobot.com\/knowledge-hub\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/uptimerobot.com\/knowledge-hub\/#\/schema\/person\/c05598f15bcbd26ed4d53240dff2ae34","name":"Laura Clayton","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-content\/uploads\/2024\/04\/laura_clayton-150x150.jpeg","url":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-content\/uploads\/2024\/04\/laura_clayton-150x150.jpeg","contentUrl":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-content\/uploads\/2024\/04\/laura_clayton-150x150.jpeg","caption":"Laura Clayton"},"description":"Laura Clayton has over a decade of experience in the tech industry, she brings a wealth of knowledge and insights to her articles, helping businesses maintain optimal online performance. Laura's passion for technology drives her to explore the latest in monitoring tools and techniques, making her a trusted voice in the field.","sameAs":["https:\/\/www.linkedin.com\/in\/laura-clayton-b00a4aa4\/"],"url":"https:\/\/uptimerobot.com\/knowledge-hub\/author\/laura\/"}]}},"_links":{"self":[{"href":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-json\/wp\/v2\/posts\/95","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-json\/wp\/v2\/comments?post=95"}],"version-history":[{"count":0,"href":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-json\/wp\/v2\/posts\/95\/revisions"}],"wp:attachment":[{"href":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-json\/wp\/v2\/media?parent=95"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-json\/wp\/v2\/categories?post=95"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/uptimerobot.com\/knowledge-hub\/wp-json\/wp\/v2\/tags?post=95"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}