Thread:Project:Support desk/index file exception on save/reply

(Note, this type of error isn't usually referred to as an exception).

Probably caused by your web server configuration. Do you have apache's mod_security enabled?

Can you look at your apache error_log (on many servers this is located in /var/log/apache/error_log, but could be somewhere else depending on how your server is set up). Whatever caused the 403 error to happen most likely resulted in an entry in the error_log.