I'm running into an intriguing problem with ISA2004. Authentication credentials aren't being passed to IIS servers on our local network. If I type in http://hostname <http://hostname/> , it will pass the proper credentials, if I type in http://hostname.mapsnet.org <http://hostname.mapsnet.org/> , it will NOT pass the authentication information. I played around with several variations in the internal Network properties in ISA2004, but it doesn't seem to make much of a difference. The closest I can get is to bring up a login box when I add the specific hostname to the "Directly access these servers" portion, it is still stripping the credentials.