{"id":8406,"date":"2025-04-02T09:51:41","date_gmt":"2025-04-02T17:51:41","guid":{"rendered":"https:\/\/cheapsslsecurity.com\/blog\/?p=8406"},"modified":"2025-04-02T09:51:42","modified_gmt":"2025-04-02T17:51:42","slug":"how-to-fix-common-security-certificate-error-issues","status":"publish","type":"post","link":"https:\/\/cheapsslsecurity.com\/blog\/how-to-fix-common-security-certificate-error-issues\/","title":{"rendered":"A Site Owner&#8217;s Guide: How to Fix 10 Common Security Certificate Error Issues"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">This ultimate resource on 10 common security certificate errors will help you eliminate these issues from your site<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Become an SSL security certificate error buster! Today, we&#8217;ll look at 10 of the most common security certificate error messages you&#8217;ll see in Chrome, Firefox, and OpenSSL. Each resource: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>explains what the HTTPS certificate error is, <\/li>\n\n\n\n<li>shows you what it looks like in up to two of the major browsers, and <\/li>\n\n\n\n<li>provides solutions for how to fix it and eliminate it from your website.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Guide to 10 Security Certificate Error Issues and How to Fix Them<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"580\" src=\"https:\/\/cheapsslsecurity.com\/blog\/wp-content\/uploads\/2025\/04\/security-certificate-error-illustration-1024x580.jpg\" alt=\"An illustration that demonstrates what happens when you have an SSL certificate error on your website (i.e., no secure connections and data is left at risk to compromise)\" class=\"wp-image-8444\" srcset=\"https:\/\/cheapsslsecurity.com\/blog\/wp-content\/uploads\/2025\/04\/security-certificate-error-illustration-1024x580.jpg 1024w, https:\/\/cheapsslsecurity.com\/blog\/wp-content\/uploads\/2025\/04\/security-certificate-error-illustration-300x170.jpg 300w, https:\/\/cheapsslsecurity.com\/blog\/wp-content\/uploads\/2025\/04\/security-certificate-error-illustration-1536x871.jpg 1536w, https:\/\/cheapsslsecurity.com\/blog\/wp-content\/uploads\/2025\/04\/security-certificate-error-illustration.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Click on the relevant SSL certificate error in the table below. Each link will direct you to a detailed resource on that specific security certificate error code and provide solutions on how to resolve it quickly.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><a><strong>Category<\/strong><\/a><\/td><td><strong>Security Certificate Error Code<\/strong><\/td><td><strong>What This Security Error Means<\/strong><\/td><\/tr><tr><td>1. Expired Certificate<\/td><td><strong>Chrome:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/p\/how-to-fix-err_cert_date_invalid\">NET_ERR_CERT_DATE_INVALID<\/a> <br><strong>Firefox:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/blog\/how-to-fix-sec_error_expired_certificate-error-in-firefox\/\">SEC_ERROR_EXPIRED_CERTIFICATE<\/a> <br><strong>OpenSSL:<\/strong> <a href=\"https:\/\/x509errors.org\/#:~:text=X509_\u00adV_\u00adERR_\u00adCERT_\u00adHAS_\u00adEXPIRED\">X509_V_ERR_CERT_HAS_EXPIRED<\/a><\/td><td>The <a href=\"https:\/\/cheapsslsecurity.com\/blog\/what-does-security-certificate-expired-mean\/\">certificate is expired<\/a>, and data may be compromised.<\/td><\/tr><tr><td>2. Revoked Certificate<\/td><td><strong>Chrome:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/p\/your-guide-for-how-to-fix-the-net-err_cert_revoked-error-in-google-chrome\/\">NET:ERR_CERT_REVOKED<\/a> and NET_ERROR(CERT_REVOKED, -206) and <br><strong>Firefox:<\/strong> SEC_ERROR_REVOKED_CERTIFICATE <br><strong>OpenSSL:<\/strong> <a href=\"https:\/\/x509errors.org\/#:~:text=X509_%C2%ADV_%C2%ADERR_%C2%ADCRL_%C2%ADHAS_%C2%ADEXPIRED-,X509_%C2%ADV_%C2%ADERR_%C2%ADCERT_%C2%ADREVOKED\">X509_V_ERR_CERT_REVOKED<\/a><\/td><td>SSL\/TLS revocations can stem from misconfigurations, key compromises, certificate misissuance issues, fraudulent certificate uses, etc.<\/td><\/tr><tr><td>3. Untrusted Certificate Authority<\/td><td><strong>Chrome:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/p\/steps-to-resolve-the-net-err_cert_authority_invalid-error-in-google-chrome\/\">NET::ERR_CERT_AUTHORITY_INVALID<\/a> or ERR_CERT_AUTHORITY_INVALID (-202) or <a href=\"https:\/\/cheapsslsecurity.com\/blog\/how-to-fix-err-ssl-server-cert-bad-format-error\/\">ERR_SSL_SERVER_CERT_BAD_FORMAT<\/a> <br><strong>Firefox:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/p\/error-code-sec_error_unknown_issuer-how-to-fix-it-in-firefox\/\">SEC_ERROR_UNKNOWN_ISSUER<\/a> <br><strong>OpenSSL:<\/strong> <a href=\"https:\/\/x509errors.org\/#:~:text=X509_%C2%ADV_%C2%ADERR_%C2%ADOCSP_%C2%ADCERT_%C2%ADUNKNOWN\">X509_V_ERR_OCSP_CERT_UNKNOWN<\/a><\/td><td>The <a href=\"https:\/\/cheapsslsecurity.com\/blog\/what-is-an-ssl-certificate-why-do-you-need-it\/\">SSL\/TLS certificate<\/a> is expired, you\u2019re using a <a href=\"https:\/\/cheapsslsecurity.com\/blog\/self-signed-ssl-versus-trusted-ca-signed-ssl-certificate\/\">self-signed certificate<\/a>, or the certificate isn\u2019t correctly installed.<\/td><\/tr><tr><td>4. Certificate Misconfiguration<\/td><td><strong>Chrome:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/blog\/fix-err-cert-common-name-invalid\/\">NET::ERR_CERT_COMMON_NAME_INVALID<\/a> or ERR_CERT_COMMON_NAME_INVALID (-200) <br><strong>Firefox: <\/strong>SEC_ERROR_CERT_NOT_IN_NAME_SPACE <br><strong>OpenSSL:<\/strong> <a href=\"https:\/\/x509errors.org\/#:~:text=X509_\u00adV_\u00adERR_\u00adHOSTNAME_\u00adMISMATCH\">X509_V_ERR_HOSTNAME\u00adMISMATCH<\/a><\/td><td>The error can be caused by a domain name mismatch, a redirection issue, a <a href=\"https:\/\/cheapsslsecurity.com\/sslproducts\/cheap-wildcard-ssl-certificates.html\">wildcard<\/a> problem, or the use of a self-signed certificate.<\/td><\/tr><tr><td>5. Weak Algorithm<\/td><td><strong>Chrome:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/p\/how-to-fix-net-err_cert_weak_signature_algorithm-in-google-chrome\/\">NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM<\/a> or ERR_CERT_WEAK_SIGNATURE_ALGORITHM (-208) <strong>Firefox:<\/strong> SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED <br><strong>OpenSSL:<\/strong> <a href=\"https:\/\/x509errors.org\/#:~:text=X509_\u00adV_\u00adERR_\u00adCA_\u00adMD_\u00adTOO_\u00adWEAK\">X509_V_ERR_CA_MD_TOO_WEAK<\/a><\/td><td>The certificate is using an outdated, insecure <a href=\"https:\/\/cheapsslsecurity.com\/blog\/decoded-examples-of-how-hashing-algorithms-work\/\">hash algorithm<\/a>.<\/td><\/tr><tr><td>6. Public Key Pinning Issue&nbsp;<\/td><td><strong>Chrome:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/blog\/how-to-fix-neterr_ssl_pinned_key_not_in_cert_chain\/\">NET::ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN<\/a> <strong>Firefox:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/p\/how-to-fix-mozilla-pkix-error-key-pinning-failure\/\">Error code: MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE<\/a> &nbsp;<\/td><td>The <a href=\"https:\/\/cheapsslsecurity.com\/blog\/private-key-and-public-key-explained\/\">public key<\/a> doesn\u2019t belong to the pinned certificate or hasn&#8217;t been pinned.<\/td><\/tr><tr><td>7. Certificate Transparency<\/td><td><strong>Chrome:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/blog\/fix-err_certificate_transparency_required-error-in-chrome\/\">ERR_CERTIFICATE_TRANSPARENCY_REQUIRED<\/a> <br><strong>Firefox:<\/strong> MOZILLA_PKIX_ERROR_INSUFFICIENT_CERTIFICATE_TRANSPARENCY<br><strong>OpenSSL:<\/strong> X509_V_ERR_INVALID_CA<\/td><td>Your website uses an SSL\/TLS certificate that isn&#8217;t on the public certificate transparency logs.<\/td><\/tr><tr><td>8. Protocol or Cipher Problem<\/td><td><strong>Chrome:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/blog\/how-to-fix-err_ssl_version_or_cipher_mismatch-error\/\">ERR_SSL_VERSION_OR_CIPHER_MISMATCH<\/a> (formerly SSL_OBSOLETE_VERSION) <br><strong>Firefox:<\/strong> Error code: SSL_ERROR_NO_CYPHER_OVERLAP <br><strong>OpenSSL:<\/strong> X509_V_ERR_SIGNATURE_ALGORITHM_MISMATCH<\/td><td>The available SSL protocol version or cipher suite is too old, or the website doesn\u2019t support or use the SSL protocol.<\/td><\/tr><tr><td>9. Protocol Issue<\/td><td><strong>Chrome:<\/strong> <a href=\"https:\/\/cheapsslsecurity.com\/p\/how-to-fix-err-ssl-protocol-in-wordpress\/\">ERR_SSL_PROTOCOL_ERROR<\/a> or <a href=\"https:\/\/cheapsslsecurity.com\/p\/how-to-fix-err_ssl_version_interference-in-google-chrome-within-minutes\/\">ERR_SSL_VERSION_INTERFERENCE<\/a> (NOTE: This second error code is an old one Google has now removed) <br><strong>Firefox:<\/strong> Error code: SSL_ERROR_UNSUPPORTED_VERSION <br><strong>OpenSSL:<\/strong> TLS_PROCESS_CLIENT_HELLO:UNSUPPORTED PROTOCOL<\/td><td>Your server supports only <a href=\"https:\/\/cheapsslsecurity.com\/blog\/tls-1-3-everything-you-need-to-know\/\">TLS 1.3<\/a>, or there\u2019s an incompatibility issue between the browser and the website. &nbsp;<\/td><\/tr><tr><td>10. Unsecure Connection<\/td><td><strong>Chrome<\/strong>: <a href=\"https:\/\/cheapsslsecurity.com\/p\/how-to-fix-err_ssl_unrecognized_name_alert\/\">ERR_SSL_UNRECOGNIZED_NAME_ALERT<\/a> <br><strong>Firefox:<\/strong> Error code: SSL_ERROR_UNRECOGNIZED_NAME_ALERT<\/td><td><a href=\"https:\/\/cheapsslsecurity.com\/blog\/tls-1-3-everything-you-need-to-know\/\"><\/a>The browser doesn\u2019t recognize your SSL certificate or the website isn\u2019t configured to load over <a href=\"https:\/\/cheapsslsecurity.com\/blog\/your-guide-to-https-port-443-and-why-its-critical-to-security\/\">HTTPS<\/a>.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Final Thoughts About How to Fix the Most Common Security Certificate Error Messages<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A security certificate error can impact your reputation and credibility as a website owner. If not fixed, this issue can compromise the security of your customers and leave your in-transit data vulnerable. The solutions mentioned in this article will help you correctly identify the root cause and fix the SSL error.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pro tip:<\/strong> Be proactive. Use only publicly trusted SSL\/TLS certificates obtained from a publicly trusted CA or an authorized reseller like <a href=\"https:\/\/cheapsslsecurity.com\/\">CheapSSLsecurity.com<\/a>. This simple action will help reduce the risk of getting a security certificate error in the first place.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This ultimate resource on 10 common security certificate errors will help you eliminate these issues from your site Become an SSL security certificate error buster! Today, we&#8217;ll look at 10 of the most common security certificate error messages you&#8217;ll see in Chrome, Firefox, and OpenSSL. Each resource: Guide to 10 Security Certificate Error Issues and<\/p>\n","protected":false},"author":8,"featured_media":8412,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[135],"tags":[980,49],"class_list":["post-8406","post","type-post","status-publish","format-standard","has-post-thumbnail","category-website-security","tag-security-certificate-error","tag-troubleshoot-ssl-error"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A Site Owner&#039;s Guide: How to Fix 10 Common Security Certificate Error Issues<\/title>\n<meta name=\"description\" content=\"Running into an SSL security certificate error? Explore 10 common HTTP certificate errors in Chrome, Firefox, and OpenSSL &amp; how to fix them.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cheapsslsecurity.com\/blog\/how-to-fix-common-security-certificate-error-issues\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Site Owner&#039;s Guide: How to Fix 10 Common Security Certificate Error Issues\" \/>\n<meta property=\"og:description\" content=\"Running into an SSL security certificate error? Explore 10 common HTTP certificate errors in Chrome, Firefox, and OpenSSL &amp; how to fix them.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cheapsslsecurity.com\/blog\/how-to-fix-common-security-certificate-error-issues\/\" \/>\n<meta property=\"og:site_name\" content=\"Savvy Security\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/cheapsslsecurities\" \/>\n<meta property=\"article:published_time\" content=\"2025-04-02T17:51:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-04-02T17:51:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cheapsslsecurity.com\/blog\/wp-content\/uploads\/2025\/03\/security-certificate-error-feature.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Savvy Security\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@sslsecurity\" \/>\n<meta name=\"twitter:site\" content=\"@sslsecurity\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Savvy Security\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/how-to-fix-common-security-certificate-error-issues\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/how-to-fix-common-security-certificate-error-issues\\\/\"},\"author\":{\"name\":\"Savvy Security\",\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/#\\\/schema\\\/person\\\/1ce9a5743b7f25b5be6e4972864b4493\"},\"headline\":\"A Site Owner&#8217;s Guide: How to Fix 10 Common Security Certificate Error Issues\",\"datePublished\":\"2025-04-02T17:51:41+00:00\",\"dateModified\":\"2025-04-02T17:51:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/how-to-fix-common-security-certificate-error-issues\\\/\"},\"wordCount\":693,\"image\":{\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/how-to-fix-common-security-certificate-error-issues\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/03\\\/security-certificate-error-feature.jpg\",\"keywords\":[\"Security Certificate Error\",\"Troubleshoot SSL Error\"],\"articleSection\":[\"Website Security\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/how-to-fix-common-security-certificate-error-issues\\\/\",\"url\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/how-to-fix-common-security-certificate-error-issues\\\/\",\"name\":\"A Site Owner's Guide: How to Fix 10 Common Security Certificate Error Issues\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/how-to-fix-common-security-certificate-error-issues\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/how-to-fix-common-security-certificate-error-issues\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/03\\\/security-certificate-error-feature.jpg\",\"datePublished\":\"2025-04-02T17:51:41+00:00\",\"dateModified\":\"2025-04-02T17:51:42+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/blog\\\/#\\\/schema\\\/person\\\/1ce9a5743b7f25b5be6e4972864b4493\"},\"description\":\"Running into an SSL security certificate error? 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