The authentication test diagnostic works similarly to the LDAP settings diagnostic however it displays less information and warnings focusing more on returning the results of any authentication plugin in the system.

The system requires a username and password to attempt to validate the user request. These should be entered as per usual with the system to work out which errors are returned by the underlying framework.

In this case we find that the Advanced LDAP plugin authenticated the user successfully whilst OpenFire returned a "Could not authenticate" error, the External Login plugin return no error and the core Joomla! authentication plugin returned "Invalid password". In this case the user would have been logged in as it only requires one authentication plugin to validate a user, however this can be used to determine the true error as to why a user isn't being authenticated properly.