{"id":1755,"date":"2023-11-23T05:28:44","date_gmt":"2023-11-23T05:28:44","guid":{"rendered":"https:\/\/certera.com\/kb\/?p=1755"},"modified":"2024-10-08T04:25:18","modified_gmt":"2024-10-08T04:25:18","slug":"how-to-fix-server-has-a-weak-ephemeral-diffie-hellman-public-key-warning-message","status":"publish","type":"post","link":"https:\/\/certera.com\/kb\/how-to-fix-server-has-a-weak-ephemeral-diffie-hellman-public-key-warning-message\/","title":{"rendered":"How to Fix Server Has a Weak Ephemeral Diffie-Hellman Public Key Warning Message?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Have you ever clicked on a website and been greeted by an ERR_SSL_WEAK_EPHEMERAL_DH_KEY security error instead of the page? It&#8217;s a common security warning that indicates that the security of the site that you are attempting to access isn&#8217;t &#8211; strong enough. Modern browsers, like &#8211; Google Chrome, don&#8217;t let you connect to such websites to protect your privacy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, in this article, we will understand what exactly this error is and what are the reasons why this error pops up, and most importantly part &#8211; &#8220;how to get it fixed.&#8221;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is the ERR_SSL_WEAK_EPHEMERAL_DH_KEY Error?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ERR_SSL_WEAK_EPHEMERAL_DH_KEY is an error that pops up when you try to connect to a website using an &#8211; &#8220;<strong>outdated SSL security code<\/strong>.&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When you use updated browsers like Mozilla Firefox, they won&#8217;t let you access websites if the security code is outdated. They will pop the <strong>Server Has a Weak Ephemeral Diffie-Hellman Public Key warning message<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Note:<\/strong> If you are not the webmaster (the person who owns or manages the website), you won&#8217;t be able to fix this issue.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/certera.com\/\"><img decoding=\"async\" width=\"960\" height=\"150\" sizes=\"(max-width: 960px) 100vw, 960px\" src=\"https:\/\/certera.com\/kb\/wp-content\/uploads\/2024\/05\/buy-ssl-certificates-cta-jpg.webp\" alt=\"Buy SSL Certificates\" class=\"wp-image-2028\" srcset=\"https:\/\/certera.com\/kb\/wp-content\/uploads\/2024\/05\/buy-ssl-certificates-cta-jpg.webp 960w, https:\/\/certera.com\/kb\/wp-content\/uploads\/2024\/05\/buy-ssl-certificates-cta-300x47.webp 300w, https:\/\/certera.com\/kb\/wp-content\/uploads\/2024\/05\/buy-ssl-certificates-cta-768x120.webp 768w\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Resolve the ERR_SSL_WEAK_EPHEMERAL_DH_KEY Error?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>To fix the issue, try two methods:<\/strong><\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Update your server for Elliptic Curve Diffie-Hellman support.<\/li>\n\n\n\n<li>Turn off Ephemeral Diffie-Hellman (DHE).<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s explore each method in depth.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Method 1: Update your Server for Elliptic Curve Diffie-Hellman (ECDHE) Support<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Follow the steps mentioned below to update your server for Elliptic Curve Diffie-Hellman support:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Click <strong>Search<\/strong>, placed on the taskbar.<\/li>\n\n\n\n<li>Type <strong>Run <\/strong>and press <strong>Enter<\/strong>.<\/li>\n\n\n\n<li>The <strong>Run <\/strong>dialog box will appear.<\/li>\n\n\n\n<li>In the <strong>Open <\/strong>text box, type <strong>regedit <\/strong>and press <strong>Enter<\/strong>.<\/li>\n\n\n\n<li>The <strong>Registry Editor <\/strong>window will appear.<\/li>\n\n\n\n<li>Navigate to <strong>HKEY_LOCAL_MACHINE &gt; SYSTEM &gt; CurrentControlSet &gt; Control &gt; SecurityProviders &gt; SCHANNEL &gt; KeyExchangeAlgorithms<\/strong>.<\/li>\n\n\n\n<li>Right-click on <strong>KeyExchangeAlgorithms<\/strong>.<\/li>\n\n\n\n<li>From the list, select <strong>New<\/strong>.<\/li>\n\n\n\n<li>Click Key.<\/li>\n\n\n\n<li>Name the new key <strong>PKCS<\/strong>.<\/li>\n\n\n\n<li>Right-click on the <strong>PKCS <\/strong>key.<\/li>\n\n\n\n<li>From the list, select <strong>New<\/strong>.<\/li>\n\n\n\n<li>Click <strong>DWORD (32-bit) Value<\/strong>.<\/li>\n\n\n\n<li>Name this new <strong>DWORD <\/strong>as <strong>ClientMinKeyBitLength<\/strong>.<\/li>\n\n\n\n<li>Double-click on <strong>ClientMinKeyBitLength<\/strong>.<\/li>\n\n\n\n<li>In the <strong>Value data<\/strong> box, enter the desired minimum key length (<strong>1024 <\/strong>is recommended).<\/li>\n\n\n\n<li>Click <strong>OK<\/strong>.<\/li>\n\n\n\n<li>Close the <strong>Registry Editor <\/strong>window.<\/li>\n\n\n\n<li><strong>Restart <\/strong>the server.<\/li>\n\n\n\n<li>Try re-accessing the site.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Method 2: Turn off Ephemeral Diffie-Hellman (DHE)<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Case1<strong>:<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">If you are using IIS as your web server, follow the steps mentioned below to disable Ephemeral Diffie-Hellman (DHE):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Navigate to <strong>HKEY_LOCAL_MACHINE &gt; SYSTEM &gt; CurrentControlSet &gt; Control &gt; SecurityProviders &gt; SCHANNEL &gt; KeyExchangeAlgorithms &gt; Diffie-Hellman<\/strong>.<\/li>\n\n\n\n<li>Modify the key <strong>Enabled <\/strong>with a <strong>DWORD <\/strong>value of <strong>0<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Case2:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">If you are using an Apache web server, follow the steps mentioned below to disable DHE:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Find any of these files in the <strong>Apache conf <\/strong>directory &#8211; <strong>ssl.conf <\/strong>or <strong>httpd.conf<\/strong>.<\/li>\n\n\n\n<li>Search for the <strong>SSLCipherSuite keyword string value<\/strong>.<\/li>\n\n\n\n<li>Add &#8220;<strong>! EDH: ! DHE: ! DH: ! ECDH<\/strong>,&#8221; after <strong>ALL:<\/strong> in the cipher spec to disable Diffie-Hellman.<\/li>\n\n\n\n<li>Make this change in every SSL configuration if you are not using one global configuration.<\/li>\n\n\n\n<li><strong>Restart <\/strong>the web server.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fixing the \u201cERR_SSL_WEAK_EPHEMERAL_DH_KEY error\u201d is paramount for website security and user trust. This error, indicating outdated SSL security code, can be resolved by &#8211; &#8220;updating your server for Elliptic Curve Diffie-Hellman support&#8221; or &#8220;disabling Ephemeral Diffie-Hellman.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Have you ever clicked on a website and been greeted by an ERR_SSL_WEAK_EPHEMERAL_DH_KEY security error instead of the page? It&#8217;s a common security warning that indicates that the security of the site that you are attempting to access isn&#8217;t &#8211; strong enough. Modern browsers, like &#8211; Google Chrome, don&#8217;t let you connect to such websites<span class=\"morelink d-block mt-3\"><a href=\"https:\/\/certera.com\/kb\/how-to-fix-server-has-a-weak-ephemeral-diffie-hellman-public-key-warning-message\/\">Read More<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":1779,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[280,281],"class_list":["post-1755","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ssl-errors","tag-fix-the-err_ssl_weak_ephemeral_dh_key-error","tag-server-has-a-weak-ephemeral-diffie-hellman-public-key-error","entry"],"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 ERR_SSL_WEAK_EPHEMERAL_DH_KEY Error?<\/title>\n<meta name=\"description\" content=\"Facing issue with error messages like Server has a weak ephemeral Diffie-Hellman public key? 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