Although, it is not part of the TCP/IP protocols, some less expensive routers (and gateways) will reset their open port permissions under such a fault. Perhaps, he needs to use his browser to go into his router and check which ports are allowed to be open, and then allow single port forwarding on 21000 and 22000. With most routers you open up IE or Firefox and go to something like 192.168.1.1 and then make changes under the port forwarding section. Three separate components must all be in agreement to allow the connections you wish; The router he uses, the software firewall he is using if any (like Zone Alarm for example) and Network Discovery (under the Windows 7 or Vista network settings). Remote desktop as mentioned above is probably not the correct terminology since this is shell software (as part of Windows, Mac or Linux) for taking over another computer remotely to affect upgrades (for example if a Microsoft tech tries to fix your registry errors remotely from their terminal in say, Seattle, WA).
Try it and see, - S!
Last edited by TheEngineer; 03/01/10 05:37 PM.