For several years I have been able to use RDC to connect to our SBS2003 from inside or outside of our network. Suddenly this has stopped working. i am not able to connect to the server from inside the network (I haven't tried externally yet, but I wouldn't expect it to work). I can connect to a different server on our network from the same (XP) client. I've also tried to connect to the SBS from a different (Win7) client and it has the same problem.
The error is:
'This computer can't connect to the remote computer. Try connecting again. If the problem continues, contact the owner of the remote computer or your network administrator.'
Some months ago I changed the listening port, but I reconfigured the firewall/router and it has been working fine since then, until this morning.
Any help would be great.