Ok - so here's the deal. I have changed the default Terminal Services port (RDP) for TCP & UDP on my Sonicwall router. I've also changed the port for RDP in regedit on 4 Win7 computers that are the hosts.
3 of them work no problem with the new specified RDP port number both internally and externally.
One stubborn PC won't work with RDP after the port number change either internally or externally. I've checked Windows Firewall on that specific PC and all looks ok.
If I go back to Regedit and change the port back to 3389 on the offending PC it at least works internally (obviously it would not work externally due to Sonicwall pointing to a different port). If I change it again to my new port number it's a no-opp. This PC had no problem with external access before the port change and no problem if it's set to 3389. If I open 3389 backup on my Sonicwall I can re-access this cruel and heartless PC.
Any Ideas? THANKS for any help & Happy Holidays to all!!