{"id":2052,"date":"2025-04-01T20:50:11","date_gmt":"2025-04-01T20:50:11","guid":{"rendered":"https:\/\/cheapsslsecurity.com\/p\/?p=2052"},"modified":"2025-04-01T20:50:11","modified_gmt":"2025-04-01T20:50:11","slug":"how-to-fix-mozilla-pkix-error-key-pinning-failure","status":"publish","type":"post","link":"https:\/\/cheapsslsecurity.com\/p\/how-to-fix-mozilla-pkix-error-key-pinning-failure\/","title":{"rendered":"How to Fix the Error \u2018MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE\u2019 in Firefox"},"content":{"rendered":"<h2>Learn What to Do When Your Certificate Uses Public Key Pinning<\/h2>\n<p>The <a href=\"https:\/\/cheapsslsecurity.com\/blog\/private-key-and-public-key-explained\/\">public key<\/a> the web browser uses to verify the validity of the SSL\/TLS certificate&#8217;s signature is incorrect or isn&#8217;t pinned to the HTTP header. Key pinning may help you minimize the risk of MITM attacks. However, if you don&#8217;t do it right, it can do more harm than good.<\/p>\n<p>Considering that Firefox, Chrome, and other major browsers have <a href=\"https:\/\/scotthelme.co.uk\/hpkp-is-no-more\/\">eliminated support for HPKP<\/a>\u00a0(i.e., HTTP public key pinning), it means that sites shouldn\u2019t be using it.<\/p>\n<p><!--more--><\/p>\n<h2>What &#8216;MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE&#8217; Looks Like in Firefox &amp; Chrome<\/h2>\n<ul>\n<li><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><\/li>\n<li><strong>Firefox: <\/strong>Error code: MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE<\/li>\n<\/ul>\n<p>Wondering what this looks like in the real world? Here&#8217;s a look at how Firefox displays the error &#8220;MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE&#8221;:<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-2061 lazyload\" data-src=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/firefox-mozilla-pkix-error-key-pinning-failure.png\" alt=\"How the error MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE displays in Firefox\" width=\"1195\" height=\"523\" data-srcset=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/firefox-mozilla-pkix-error-key-pinning-failure.png 1195w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/firefox-mozilla-pkix-error-key-pinning-failure-300x131.png 300w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/firefox-mozilla-pkix-error-key-pinning-failure-1024x448.png 1024w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/firefox-mozilla-pkix-error-key-pinning-failure-768x336.png 768w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/firefox-mozilla-pkix-error-key-pinning-failure-500x219.png 500w\" data-sizes=\"(max-width: 1195px) 100vw, 1195px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1195px; --smush-placeholder-aspect-ratio: 1195\/523;\" \/><\/p>\n<p><em>Image caption: The screenshot shows the public key pinning security certificate error in Mozilla&#8217;s Firefox browser.<\/em><\/p>\n<p>Here&#8217;s a quick peek at how this error displays in Chrome to your website visitors:<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-2060 lazyload\" data-src=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/chrome-pinned-key-not-in-cert-chain-ssl-certificate-error.png\" alt=\"A screenshot showing what the error &quot;NET:ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN&quot; looks like in Google Chrome\" width=\"1035\" height=\"655\" data-srcset=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/chrome-pinned-key-not-in-cert-chain-ssl-certificate-error.png 1035w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/chrome-pinned-key-not-in-cert-chain-ssl-certificate-error-300x190.png 300w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/chrome-pinned-key-not-in-cert-chain-ssl-certificate-error-1024x648.png 1024w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/chrome-pinned-key-not-in-cert-chain-ssl-certificate-error-768x486.png 768w, https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/chrome-pinned-key-not-in-cert-chain-ssl-certificate-error-474x300.png 474w\" data-sizes=\"(max-width: 1035px) 100vw, 1035px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1035px; --smush-placeholder-aspect-ratio: 1035\/655;\" \/><\/p>\n<p><em>Image caption: The screenshot shows Chrome\u2019s version of the public key pinning security certificate error.<\/em><\/p>\n<h2>How to Fix the &#8216;MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE&#8217; Error<\/h2>\n<h3><strong>Method #1: Stop Pinning Your Public Keys<\/strong><\/h3>\n<p>You can manually delete the key pin by removing it from Firefox\u2019s <strong>SiteSecurityServiceState.txt<\/strong> file, which is located in your profile folder. (For example, mine is located under my user profile at this file path: \/appdata\/roaming\/mozilla\/firefox\/profiles\/k3ipgy29.default-release\/sitesecurityservicestate.txt.)<\/p>\n<p><em><strong>Note:<\/strong> Software such as Thunderbird and Firefox-based browsers (e.g., Librewolf and Waterfox) also include a SiteSecuriyServiceState.txt file. Therefore, ensure you locate the correct .txt file.<\/em><\/p>\n<p>Wondering what this file does? It caches HPKP- and HSTS-related settings for domains you\u2019ve visited while using the browser.<\/p>\n<p>To start, you must close the Firefox browser. Once you locate and open the file, scroll through until you find the entries for the domain and delete all related data. Save the file and restart your browser.<\/p>\n<p>If you don\u2019t see the domain information listed in that file, then don\u2019t delete anything from it. Try the next security certificate error resolution method.<\/p>\n<h3><strong>Method #2: Fetch the ICA Key and Pin It<\/strong><\/h3>\n<p>Pinning is a risky maneuver and, ideally, should be avoided. However, if you can&#8217;t really do without pinning, download a copy of the certificate&#8217;s public key from the <a href=\"https:\/\/cheapsslsecurity.com\/blog\/what-are-root-certificates-and-intermediate-certificates\/\">intermediate CA\u2019s<\/a> website and pin it in lieu of the leaf certificate.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn What to Do When Your Certificate Uses Public Key Pinning The public key the web browser uses to verify the validity of the SSL\/TLS certificate&#8217;s signature is incorrect or isn&#8217;t pinned to the HTTP header. Key pinning may help &hellip; <a href=\"https:\/\/cheapsslsecurity.com\/p\/how-to-fix-mozilla-pkix-error-key-pinning-failure\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[15,38,16],"class_list":["post-2052","post","type-post","status-publish","format-standard","hentry","category-ssl-error-codes","tag-error-codes","tag-key-pinning","tag-troubleshooting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Fix the Error \u2018MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE\u2019 in Firefox - Cheap SSL Security<\/title>\n<meta name=\"description\" content=\"Learn how to identify and fix the error &#039;MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE&#039; in Firefox (and Google Chrome)\" \/>\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\/p\/how-to-fix-mozilla-pkix-error-key-pinning-failure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Fix the Error \u2018MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE\u2019 in Firefox - Cheap SSL Security\" \/>\n<meta property=\"og:description\" content=\"Learn how to identify and fix the error &#039;MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE&#039; in Firefox (and Google Chrome)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cheapsslsecurity.com\/p\/how-to-fix-mozilla-pkix-error-key-pinning-failure\/\" \/>\n<meta property=\"og:site_name\" content=\"Cheap SSL Security\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/CheapSSLSecurities\" \/>\n<meta property=\"article:published_time\" content=\"2025-04-01T20:50:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cheapsslsecurity.com\/p\/wp-content\/uploads\/2025\/03\/firefox-mozilla-pkix-error-key-pinning-failure.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1195\" \/>\n\t<meta property=\"og:image:height\" content=\"523\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"casey.crane\" \/>\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=\"casey.crane\" \/>\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\\\/p\\\/how-to-fix-mozilla-pkix-error-key-pinning-failure\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/p\\\/how-to-fix-mozilla-pkix-error-key-pinning-failure\\\/\"},\"author\":{\"name\":\"casey.crane\",\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/p\\\/#\\\/schema\\\/person\\\/d9c1744bb0931c1942814061a5aca108\"},\"headline\":\"How to Fix the Error \u2018MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE\u2019 in Firefox\",\"datePublished\":\"2025-04-01T20:50:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/p\\\/how-to-fix-mozilla-pkix-error-key-pinning-failure\\\/\"},\"wordCount\":438,\"image\":{\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/p\\\/how-to-fix-mozilla-pkix-error-key-pinning-failure\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/cheapsslsecurity.com\\\/p\\\/wp-content\\\/uploads\\\/2025\\\/03\\\/firefox-mozilla-pkix-error-key-pinning-failure.png\",\"keywords\":[\"error codes\",\"key pinning\",\"troubleshooting\"],\"articleSection\":[\"SSL Errors\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/cheapsslsecurity.com\\\/p\\\/how-to-fix-mozilla-pkix-error-key-pinning-failure\\\/\",\"url\":\"https:\\\/\\\/cheapsslsecurity.com\\\/p\\\/how-to-fix-mozilla-pkix-error-key-pinning-failure\\\/\",\"name\":\"How to Fix the Error \u2018MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE\u2019 in Firefox - 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