There is nothing wrong with the access rights of your configuration file. My 'configuration' file has exactly the same rights.
I am afraid, however, that your configuration file contains one or more entries which are causing your troubles. You might want to check /var/log/httpd/admin_error_log for any clues. If that doesn't reveal anything you should compare a plain configuration file with yours and try to find the entries responsable for your problem.
Good luck.