Comment: Time out problem

Time-out is handled by the web service (in your case, IIS), and it is related to the maximum amount of time allowed for storage of session data. Unfortunately I have little experience of IIS and cannot provide the name of the parameter to check at your site.

Also, it seems unclear why your server send PHP code instead of interpreting it smoothly. Do not hesitate to take some screenshot and to post it here. This would augment chances to diagnose your issue.