Better Stack Team
Updated on March 9, 2023


NET::ERR_CERT_COMMON_NAME_INVALID error when opening your website.

Cause of the problem

A NET::ERR_CERT_COMMON_NAME_IN error occurs when the domain the SSL certificate is installed on is not listed on the certificate (either as the common name, subject alternative name or covered by a wildcard).


Check if the domain has the correct certificate installed

The most common reason for this error to occur is installing an incorrect certificate to a domain. The easiest way to check whether this is to inspect the certificate and compare the issued to domain information to the domain the certificate is installed on.

Check redirects and www vs. non-www

Check if the browser is not redirecting users to the other version of your website. Then check if you're forcing the traffic through the www version of your domain. Some certificates don't cover www versions along with non-www versions.

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