Allow RDP to tunnel from internal to external network through ISA 2006 proxy server?
Posted on 2008-06-17
I have an ISA 2006 proxy server which internal users must go through to gain access to external/ internet resources. Since I implemented the server, internal users are unable to connect to RDP via web connections to external servers. I have modified the rule for internet access to allow the RDP protocol but this hasn't resolved it.
Looking further into it I understand that when you connect to a web RDP server, it simply downloads the ActiveX Terminal Services client and then tries to connect you as standard via 3389 to the server. I think this is where my trouble lies as by default the client machine will only direct port 21, 80 & 443 traffic to the ISA server. THis being the case, the 3389 connection is attempted directly from the client machine and hence, fails as the client machine has no direct internet access.
Is there any way I can get the RDP connection out through the proxy server? Or is there no other way than to bypass the proxy server for this whole process?
Feel free to ask me any more questions, thanks for your time!