Question : Access multile servers by RDP thru ISA 2006

I need to be able to access 3 servers that are behind an ISA 2006 server using RDP. One is the ISA server itself and the other tow are web servers. I have remote access to the ISA server but have not been able to get access to the other two.I have tried assigning multiple addresses to the ISA interface and I have tried assigning different port numbers for each server. In each case I can only access the ISA server (not using the port number) and not the other two servers.

Answer : Access multile servers by RDP thru ISA 2006

did you follow this procedure? if not please check any  misconfiguration issue
http://technet.microsoft.com/en-us/library/bb794770.aspx
regards,
Jose