Solved: NET::ERR_CERT_COMMON_NAME_INVALID

Problem

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).

Solution

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.

How to generate a private key for the existing .crt file on Nginx?

Unfortunately, this is not possible. You cannot generate a private key out of an existing certificate. If it would be possible, you would be able to impersonate virtually any HTTPS webserver.

Questions

How to verify SSL certificates on the command line?

To validate an SSL certificate you can use one of the following approaches, depending on the type of the certificate.

Questions

Solved: SSL_Error_rx_record_too_long

The usual cause is that the implementation of SSL on your server is not correct. The error is usually caused by a server-side problem which the server administrator will need to investigate.

Questions

Solved: Invalid command ‘SSLEngine

This frequently happens on fresh Apache servers. When Apache starts it reads through the configuration files. When it encounters `SSLEngine` directive, it considers it as unknown. This is caused by the fact that the server’s basic configuration does not have `mod_ssl` module installed or enabled.

Questions

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