NET::ERR_CERT_COMMON_NAME_INVALID Error Code Fix Guide

To keep a site secure website owners use an SSL certificate so that their site loads over HTTPS. Sometimes when visiting your site you may encounter an error code “NET::ERR_CERT_COMMON_NAME_INVALID” in Google Chrome Browser. It usually occurs due to misconfiguration of SSL. Other reason includes antivirus and firewall or another third-party extension. Don’t worry, we have come up with several solutions to fix this error.

NET::ERR_CERT_COMMON_NAME_INVALID

How to Fix NET::ERR_CERT_COMMON_NAME_INVALID Error?

Method 1: Check SSL/TLS Certificate Configuration

If your site/domain is not included in the SSL/TLS certificate you will see a “NET::ERR_CERT_COMMON_NAME_INVALID” error. It is because of a mismatch between the site URL and the certificate. So check the installed certificate from your browser under the address bar section. If the SSL is not issued to your domain then you have to fix it using your server control panel. If the certificate is SAN or wildcard, then make sure the browsing domain and subdomain is covered under SAN and Wildcard certificate.

ssl certificate

Method 2: Check date and time

Sometimes Chrome browser shows NET::ERR_CERT_COMMON_NAME_INVALID error because of the wrong date and time on your device. So you should recheck the date/time settings and adjust them if required.

date time pc

Method 3: Check browser extensions

If you have installed extensions on your chrome browser then make sure there is no bad extension. Because this could be a reason for the error. To check the culprit extension tap on the “three dots” button on the top right corner of your browser. Now select More tools > Extensions. Turn off all extensions to find the culprit extension and uninstall it to fix the SSL error.

Check browser extensions

Method 4: Check SSL/TLS certificate on both WWW and non-WWW version

SSL/TLS Certificates may not install on both the WWW and non-WWW versions of your domain by default. In that case, you have to install SSL/TLS certificate on both versions of the website. Otherwise, due to redirection from WWW to the non-WWW version, you will encounter the error. So either install a proper SSL certificate on both versions or remove redirection. You can also try to fix the error by installing the Really Simple SSL WordPress plugin.

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