The local LAN and Terminal Server recently underwent a internal IP address conversion but it was working for a couple days after the fact. Then suddenly yesterday it started only accepting LAN addresses. Anyone connecting from another site or externally to the company receives the error. "Remote Desktop can't connect to the remote computer for one of these reasons:"
So, Immediately I think Firewall. The firewall is disabled on the terminal server. All profiles, domain, private and public profiles are off. Then I think it must be the perimeter firewall, but if that were the case then the remote site should still work. I did check the perimeter firewall as well and the security and nat policies are correct.
I did several telnet tests externally and I can see the traffic going through the firewall fine. However, nothing shows up in the event logs on the terminal server for these connections. So the traffic does not look to be making it to the server at all but I can't find what that would be.
There is a server based AV running (kasperski) but it doesn't have a firewall component installed. I have tried disabling that as well without any change.
I can't figure this out!!