Timeout & 403 Forbidden Error eprocessingnetwork.com

I use eprocessingnetwork.com as my cc gateway. They show how to emulate authorize.net by changing one key file in the authorize.php file.

This was done. Then when doing test and real orders, they do process through eprocessingnetwork exactly as they are supposed to.

However, the completion page is not returned, instead I get a 403 Forbidden Error and my error page shows the requested url as

"Requested URL: /00catalog/index.php?main_page=time_out"

Anyone have any suggestions?

Forrist