Remote assistance and IAS

I am trying to use Remote Assistance and I am receiveing an error message "Remote assistance connection could not be established because the remote host name could not be resolved. Please try again"

I have an XP box requesting the assistance which is on a LAN with DC on a  WIN2K server using ISA.

 When they request assistance through MSN messenger I accept and then it says trying to connect to the computer. I then get the above error message.  I can do file sharing and whiteboard with the MSN messenger.  

Also, If I request assistance from a computer inside the LAN we are able to connect  

The XP firewalls are off so I am ""ASSUMING"" that it is the Terminal services configuration in the ISA.  I am not sure.  

Any help would be greatly appreciated.

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srikrishnakCommented: seems you are trying to connec to a remote machine over internet..Right ? if so can you check the IP address & DNS name resolutio is in place. Probably you might be having a NAT machine which is doing the translation ..Plz check these things...

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