I have found some configurations of Apache 2.2 with Mod_auth_mysql producing other 500 errors. The error log shows:

In Apache 2.2, the mod_auth_basic module may be the authoritative access module by default. To use Mod_auth_mysql add the following line as shown below in your Mod_auth_mysql configurations in httpd.conf or .htaccess files.

Before:

After:

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