Thread:Project:Support desk/403 when saving edit/reply

Your wiki configuration is a bit strange. When I try to access anything but index.php?title=..., I get proxy error.

Additionally, when I try to edit the page and save, I see that you have ConfirmEdit's QuestyCaptcha installed (yay!), but then load.php is sometimes returning no content and a 5xx error which makes the page look funny.

Look over your error log or turn on debugging and see if that reveals anything. A good start is to put

error_reporting( -1 ); ini_set( 'display_errors', 1 );

at the end of your LocalSettings.php and see if any errors are displayed.