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Remote Desktop through ISA Server 2004

I have an ISA Server 2004 sitting on a Windows Server 2003 machine.  I want to access a Windows 2008 R2 via remote desktop.  The request will be coming from the External network on the ISA Server to the Internal/LAN network on the ISA Server.  (I want to remote desktop into a server that's on my LAN from a computer on the Internet).  I would like to do this by forwarding a request on a specific random port, as we already have a server setup to do that.  But when I tried to set it up with a new server, I just can't get it to work.  Am I missing something obvious?  What steps would you take to do this?
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Principal Consultant
Commented:
I've used this guide in the past:

http://www.isaserver.org/articles/2004pubts.html