AuthPAMAuthoritative [ on|off]
server config,<VirtualHost>, <Global>
1.2.0pre3 and later
This directive allows you to control whether or not PAM is the ultimate authority on authentication. Setting this directive to on will cause authentication to fail if PAM authentication fails. The default setting, off, allows other modules and directives such as AuthUserFile and friends to authenticate users, should PAM authentication fail. If you are having problems with PAM and using other directives like AuthUserFile, set this directive to off.