Joomla! Documentation™

The items in this panel are well explained by the inline help. However, if you encounter a problem that disables normal access to the Administrator interface you may need to set Debug System by editing configuration.php with a text editor. On most Linux based hosting systems the file permissions are set to 444 which prevents saving from a text editor. Change the permission to 644 before editing. Then set $debug = true; and set $error_reporting = 'maximum'; and save. You should then get a stack trace identifying exactly where the problem occurs. You can use that to seek help in the Forums. Most problems arise from incompatible third party extensions or from problems with the hosting environment.