we have been running Authorize.net now for about 8 years with not one problem. 2 weeks ago after a customer was sent to Auth for CC and payment was complete, during the process of sending them back to our site Auth will time out and fail. completing the CC charge but NOT sending the customer back to our site with the info we need to know that the transaction completed. I have checked and tested everything I can think of including (Apache, MySQL, CPU Load, RAM Usage, Internet speed, TTL and the URL we are using) we are on a VM but the only site running so there is no load other than ours and we are only using about 1% of the server load.
