I have been trying to setup a rule which allows a client machine access through ISA to an external machine using RDP and have been unsuccessful so far. I'm running ISA 2004 in an Edge Network. I have been able to setup rules for VPN access (External to Internal), Web Proxy access to the Internet (Int to Ext), and Web Access for my local web server (Int to Int).
I have tried setting up a rule to allow RDP from Internal to External using all protocols in an outbound state with no luck.
It's a full T-1 line and the ISA server is between a Cisco router and the local LAN. The Cisco router is provided by AT&T which provides access to the Internet cloud. The ISA server is basically performing the job of Firewall, packet routing, etc. to the local LAN.