Hi all. This is a new problem and I suspect it is the result of an update because it was working fine 3 weeks ago. I can use remote desktop if I am inside our subnet but not if I am outside of it.
We have 2 sites and they are connected by a site to site VPN. Our DC's do not have the firewall turned on and they do not have Anti-Virus installed. The DC and the Mail server are VMs running on an ESXi server. I have attempted to RDP with my Win8 and Win7 laptops.
From home I have always been able to RDP to either site. Recently, I changed the port number that the border firewall listens for RDP. I tested it and used it several times with no problems. I haven't needed to remote in to site2 for a few weeks and now it gives me an error that says, "This computer cannot connect to the remote computer. Try connecting again. If the problem continues, contact the owner of the remote computer or your network administrator." The error occurs after Remote Desktop shows "configuring remote session." I never get to the login.
If I remote to site1, which has the same border firewall configuration, I have no problem. After connecting to site1 if I RDP to Site2's DC through the site-to-site link I get the same error. The error occurs when I RDP to the mail server, too. I have a Win7 computer that we run vSphere on to manage the server and I get the same error when remoting to it BUT, if I RDP from site1 to another server in site2 and then, from that server, RDP to my DC, it works fine. Again, If I am at my desk inside the network RDP works fine.
It looks kinda like a firewall port forwarding problem but the forwarding rules don't come into play across the sit-to-site link. I am left with thinking that the subnet is somehow a factor.
I did try adding the two updates, kb2667402 and kb2621440, mentioned in this thread http://social.technet.microsoft.com/Forums/en-US/winserverTS/thread/a9a8c281-c5d5-4cf0-ac1b-38006b9c5fc4 but they were already installed.
I have looked in the error logs but did not see anything.
Thanks for the help. Let me know if you need more information.
Todd MacQueen MCTS, CEH, CHFI, Security+