{"id":308,"date":"2026-09-29T10:06:09","date_gmt":"2026-09-29T17:06:09","guid":{"rendered":"https:\/\/hostandtech.com\/kb\/?p=308"},"modified":"2026-09-29T10:06:09","modified_gmt":"2026-09-29T17:06:09","slug":"fix-err-cert-common-name-invalid","status":"publish","type":"post","link":"https:\/\/hostandtech.com\/kb\/ssl\/fix-err-cert-common-name-invalid\/","title":{"rendered":"How to Fix NET::ERR_CERT_COMMON_NAME_INVALID (cPanel and Plesk)"},"content":{"rendered":"<h2>Overview<\/h2>\n<p>NET::ERR_CERT_COMMON_NAME_INVALID means the SSL certificate the server sent is valid, but it doesn&#8217;t list the exact hostname you typed. The usual fix is to make the certificate cover that name: add the missing <code class=\"\" data-line=\"\">www<\/code> or subdomain to it, or bind the right certificate to the site so the server stops sending a default one. Firefox shows the same problem as <code class=\"\" data-line=\"\">SSL_ERROR_BAD_CERT_DOMAIN<\/code>.<\/p>\n<p>This guide is for site owners on cPanel or Plesk hosting, and for visitors who want to know whether the fault is theirs. One <code class=\"\" data-line=\"\">openssl<\/code> command tells you which name the certificate really covers, and the table below maps what you see to the fix. Expect ten minutes for most cases, plus a short wait while AutoSSL reissues the certificate.<\/p>\n<h2>What causes NET::ERR_CERT_COMMON_NAME_INVALID<\/h2>\n<p>Browsers compare the address you typed with the names in the certificate&#8217;s Subject Alternative Name (SAN) list. The old Common Name field is ignored by current browsers, so &#8220;common name&#8221; in the error is a leftover label. If the address isn&#8217;t in the SAN list, you get the warning, however valid and unexpired the certificate is.<\/p>\n<table>\n<thead>\n<tr>\n<th>What you find<\/th>\n<th>Likely cause<\/th>\n<th>Go to<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Certificate lists <code class=\"\" data-line=\"\">example.com<\/code> only<\/td>\n<td>No <code class=\"\" data-line=\"\">www<\/code> in the certificate<\/td>\n<td>Fix 1<\/td>\n<\/tr>\n<tr>\n<td>Error only on a subdomain<\/td>\n<td>Subdomain not covered<\/td>\n<td>Fix 2<\/td>\n<\/tr>\n<tr>\n<td>Certificate is for another domain or the server hostname<\/td>\n<td>Wrong certificate served<\/td>\n<td>Fix 3<\/td>\n<\/tr>\n<tr>\n<td>Certificate is right but the domain points elsewhere<\/td>\n<td>DNS or CDN mismatch<\/td>\n<td>Fix 4<\/td>\n<\/tr>\n<tr>\n<td>Works for others, fails for you<\/td>\n<td>Local device or address used<\/td>\n<td>Fix 5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>How to fix it<\/h2>\n<h3>Fix 1: Add the missing www (or non-www) name<\/h3>\n<p>First see what the server sends. Run this from any Linux or macOS terminal, replacing <code class=\"\" data-line=\"\">example.com<\/code> with the hostname that fails:<\/p>\n<div class='ht-code-snippet'><button class='ht-code-snippet__copy' onclick='htCopyCode(\"code-block-1\")' type='button' aria-label='Copy code'><svg class='ht-copy-icon' viewBox='0 0 32 32' width='16' height='16' fill='currentColor'><path d='M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z'><\/path><path d='M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z'><\/path><\/svg><svg class='ht-check-icon' viewBox='0 0 32 32' width='16' height='16' fill='currentColor'><path d='M13,24l-9-9,1.414-1.414L13,21.171,26.586,7.586,28,9Z'><\/path><\/svg><\/button><span class='ht-code-snippet__feedback'>Copied to clipboard<\/span><\/p>\n<pre class='ht-code-snippet__code' id='code-block-1'><code class=\"\" data-line=\"\">echo | openssl s_client -connect example.com:443 &#092;\n  -servername example.com 2&gt;\/dev\/null &#092;\n  | openssl x509 -noout -subject -ext subjectAltName<\/code><\/pre>\n<\/div>\n<p>If the <code class=\"\" data-line=\"\">DNS:<\/code> list shows <code class=\"\" data-line=\"\">example.com<\/code> but not <code class=\"\" data-line=\"\">www.example.com<\/code> (or the reverse), that&#8217;s the fault. On cPanel:<\/p>\n<ol>\n<li>Open <strong>SSL\/TLS Status<\/strong> in the <strong>Security<\/strong> section.<\/li>\n<li>Find the domain in the list. Names without a valid certificate are flagged, and the certificate details show which names it covers.<\/li>\n<li>Click <strong>Run AutoSSL<\/strong>. Wait a few minutes and reload the page.<\/li>\n<\/ol>\n<figure class=\"wp-block-image\"><img src=\"https:\/\/hostandtech.com\/kb\/wp-content\/uploads\/2026\/09\/ssl-tls-status-cpanel-path.webp\" alt=\"Diagram of the cPanel path Security, SSL\/TLS Status, then Run AutoSSL\" width=\"1000\" height=\"700\" loading=\"lazy\" decoding=\"async\"><figcaption>SSL\/TLS Status in cPanel is where you re-run AutoSSL after adding a name.<\/figcaption><\/figure>\n<p>If <code class=\"\" data-line=\"\">www<\/code> is still missing after AutoSSL, the cause is almost always DNS. AutoSSL only adds a name it can prove you control by fetching a file from it, so <code class=\"\" data-line=\"\">www.example.com<\/code> must resolve to this server. Add the record in the <a href=\"https:\/\/hostandtech.com\/kb\/cpanel\/how-to-set-up-dns-zone-cpanel\/\">Zone Editor<\/a> (a <code class=\"\" data-line=\"\">CNAME<\/code> for <code class=\"\" data-line=\"\">www<\/code> pointing to <code class=\"\" data-line=\"\">example.com<\/code> is enough), wait for it to resolve, then run AutoSSL again. This is the step most guides skip.<\/p>\n<p>On Plesk, open the domain&#8217;s <strong>SSL\/TLS Certificates<\/strong>, reissue the Let&#8217;s Encrypt certificate and tick the option to include the <code class=\"\" data-line=\"\">www<\/code> subdomain. The <a href=\"https:\/\/hostandtech.com\/kb\/plesk-linux\/how-to-install-ssl-certificate-plesk\/\">Plesk SSL guide<\/a> has the full steps.<\/p>\n<h3>Fix 2: Cover the subdomain<\/h3>\n<p>A certificate for <code class=\"\" data-line=\"\">example.com<\/code> does not cover <code class=\"\" data-line=\"\">shop.example.com<\/code>. On cPanel, create the subdomain first, then run AutoSSL so it appears in the SAN list. For many subdomains, a wildcard certificate covers <code class=\"\" data-line=\"\">*.example.com<\/code>, but only one level deep: <code class=\"\" data-line=\"\">a.b.example.com<\/code> is not covered. <a href=\"https:\/\/hostandtech.com\/kb\/ssl\/wildcard-ssl-certificates-explained\/\">Wildcard certificates explained<\/a> covers when that is worth buying.<\/p>\n<h3>Fix 3: Stop the server sending the wrong certificate<\/h3>\n<p>If the SAN list shows another domain or the server&#8217;s own hostname, the site has no certificate of its own and the server is falling back to a default. That happens after a domain is added without a certificate, after a migration, or when a certificate was installed for an old name. Install or re-run AutoSSL for the domain. On a server you manage, open <strong>WHM &gt; SSL\/TLS &gt; Manage SSL Hosts<\/strong>, remove the stale entry, then re-run AutoSSL. If the certificate itself won&#8217;t issue, see <a href=\"https:\/\/hostandtech.com\/kb\/whm\/whm-ssl-certificate-installation-failures\/\">WHM SSL installation failures<\/a> and <a href=\"https:\/\/hostandtech.com\/kb\/ssl\/ssl-certificate-not-renewing-fix\/\">SSL certificate not renewing<\/a>.<\/p>\n<h3>Fix 4: Check that the domain points at the right server<\/h3>\n<p>Your certificate can be perfect and the browser can still be talking to a different server: an old host, a parking page or a CDN that isn&#8217;t set up for this domain.<\/p>\n<div class='ht-code-snippet'><button class='ht-code-snippet__copy' onclick='htCopyCode(\"code-block-2\")' type='button' aria-label='Copy code'><svg class='ht-copy-icon' viewBox='0 0 32 32' width='16' height='16' fill='currentColor'><path d='M28,10V28H10V10H28m0-2H10a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V10a2,2,0,0,0-2-2Z'><\/path><path d='M4,18H2V4A2,2,0,0,1,4,2H18V4H4Z'><\/path><\/svg><svg class='ht-check-icon' viewBox='0 0 32 32' width='16' height='16' fill='currentColor'><path d='M13,24l-9-9,1.414-1.414L13,21.171,26.586,7.586,28,9Z'><\/path><\/svg><\/button><span class='ht-code-snippet__feedback'>Copied to clipboard<\/span><\/p>\n<pre class='ht-code-snippet__code' id='code-block-2'><code class=\"\" data-line=\"\">dig +short example.com\ndig +short www.example.com<\/code><\/pre>\n<\/div>\n<p>Compare the addresses with your server&#8217;s IP. If a CDN sits in front, its edge certificate must also list both names; check that inside the CDN&#8217;s dashboard. See <a href=\"https:\/\/hostandtech.com\/kb\/domains\/domain-not-resolving-how-to-fix-dns-issues\/\">domain not resolving<\/a> if the records look wrong.<\/p>\n<h3>Fix 5: Rule out your own device and the address you used<\/h3>\n<ul>\n<li><strong>You typed an IP address.<\/strong> Certificates are issued to names, so <code class=\"\" data-line=\"\">https:\/\/203.0.113.10<\/code> always fails. Use the domain.<\/li>\n<li><strong>cPanel login on port 2083.<\/strong> <code class=\"\" data-line=\"\">https:\/\/example.com:2083<\/code> can show this error because the certificate on that port may belong to the server hostname. Use <code class=\"\" data-line=\"\">https:\/\/cpanel.example.com<\/code> or the hostname in your welcome email.<\/li>\n<li><strong>Antivirus HTTPS scanning or a proxy.<\/strong> Test on mobile data or another device. If it only fails on one machine, the local software is replacing the certificate. Related: <a href=\"https:\/\/hostandtech.com\/kb\/ssl\/fix-err-ssl-protocol-error\/\">ERR_SSL_PROTOCOL_ERROR<\/a>.<\/li>\n<li><strong>Very old devices without SNI.<\/strong> They get the server&#8217;s default certificate. Only a dedicated IP fixes that, and most sites don&#8217;t need to support them.<\/li>\n<\/ul>\n<h2>How to prevent it<\/h2>\n<ul>\n<li>Create the <code class=\"\" data-line=\"\">www<\/code> DNS record on the same day you add a domain, so AutoSSL includes it from the start.<\/li>\n<li>After any migration, run the <code class=\"\" data-line=\"\">openssl<\/code> command above for both the bare domain and <code class=\"\" data-line=\"\">www<\/code>.<\/li>\n<li>Redirect one version to the other once both have working certificates. <a href=\"https:\/\/hostandtech.com\/kb\/ssl\/force-https-redirect-http-to-https\/\">Force HTTPS<\/a> shows how, and <a href=\"https:\/\/hostandtech.com\/kb\/ssl\/fix-mixed-content-warnings-https\/\">mixed content<\/a> is the next thing to check.<\/li>\n<\/ul>\n<p>If the certificate still won&#8217;t cover your names after these checks, open a ticket through our <a href=\"https:\/\/hostandtech.com\/help\">help centre<\/a> with the domain and the output of the <code class=\"\" data-line=\"\">openssl<\/code> command, or look at <a href=\"https:\/\/hostandtech.com\/cloudlinux-cpanel-shared-hosting\">cPanel hosting with AutoSSL<\/a> if your current host doesn&#8217;t offer it.<\/p>\n<div class=\"ht-faq-section\">\n<h2>Frequently Asked Questions<\/h2>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">What does ERR_CERT_COMMON_NAME_INVALID mean?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>The certificate the server presented is valid but doesn\u2019t include the hostname you visited in its Subject Alternative Name list. The browser refuses the connection because it can\u2019t confirm the certificate was issued for that site.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">Why does my site work on www but not without it?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>The certificate was issued for only one of the two names, or one name doesn\u2019t point to your server so AutoSSL couldn\u2019t validate it. Add the missing DNS record, then run AutoSSL again so both names are on the certificate.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">Is ERR_CERT_COMMON_NAME_INVALID a problem on my computer or on the website?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>Test on another device or on mobile data. If the error disappears, it\u2019s local, often antivirus HTTPS scanning or a proxy. If it appears everywhere, the certificate or its binding on the server is wrong.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">Does a wildcard certificate fix it?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>It fixes subdomain errors, since *.example.com covers shop.example.com and mail.example.com. It doesn\u2019t cover the bare domain unless that name is added, and it doesn\u2019t cover deeper levels such as a.b.example.com.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">Can I click through the warning safely?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>Not on a site you don\u2019t control, because a name mismatch is also how interception attacks look. On your own site, fix the certificate instead so visitors never see the warning.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Chrome says the certificate doesn&#8217;t match the site name. One openssl command shows which names it really covers; then add the missing www or subdomain, bind the right certificate, or rule out your own device.<\/p>\n","protected":false},"author":1,"featured_media":298,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[79],"tags":[40,81,103,162,83],"class_list":["post-308","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ssl","tag-cpanel","tag-https","tag-ssl-certificate","tag-ssl-installation","tag-tls"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fix NET::ERR_CERT_COMMON_NAME_INVALID in cPanel and Plesk<\/title>\n<meta name=\"description\" content=\"Fix NET::ERR_CERT_COMMON_NAME_INVALID: check which names your certificate covers with openssl, then add www or the subdomain and re-run AutoSSL in cPanel.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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