It doesn't happen very often, but sometimes your server reports a "Error 500" after the input of a wrong user name or a wrong password in Joomla 2.5 Login, if you previously changed some settings. This tutorial shows you, what could be the trigger. Cause of this error is either a linking error or/and wrong directory- or file permissions.This two steps could be solve this problem. Step 1: Check, if you set the directory- and file permissons of your tmp-directory and log-directory correctly. You find both directories in the main directory of your Joomla CMS. Both directories will be displayed in...