We have a Windows 2003 server running IIS and a custom built ASP.net application on it. Before we switched to an ASA5520 we had a Watchguard Firebox appliance in front of it and all was good. After the switch to the ASA we started getting reports of the application not working correctly. We got the programers to look at it and the said that it seemed to be some problem with the application session state info communication with client machines. Since the application code had not changed I looked at the firewall switch. Sure enough when we run the application from inside the firewall it works as it should. Clients coming in from the outside and thru the ASA have problems. What type of configuration setting should I be lookking for on the ASA to fix this?