We have an office with a Windows 2003 SBS server and a couple of workstations. I set up Microsoft remote desktop for each of the computer in such a way that anyone could remote into the computers directly by specifiying a port. For each workstation (Windows 7 OS) I changed the RDP port to aa unique port (3389, 3390, 3391 and 3392).
I then opened the corresponding port in Windows Firewall on each workstation, and opened all of these ports in the modem/router/firewall and specified the IP address of each workstation (fixed IP addresses). The modem is DG834 Netgear which doesn't do port forwarding so that is why I went with the custom RDP port option.
Now this worked perfectly for the first three workstations but the last one (on 3392) will not work externally. If I RDP into it on the custom port locally from the server it works fine so I guess that means that it is configured fine, but if I try and RDP from outside of the LAN it doesn't respond, just comes back with a can't connect error.
I compared the modem firewall settings with the other working workstation settings and they are identical. I also tried an alternate port.
I just can't figure out why this one doesn't work. Any ideas?