My buddy Damo had his computer reformatted by a computer shop.

He has a valid copy of Worms2 version 100 patched to 105.
He has DirectX 9.0(c)
He can play offline no problem.
He can get into the internet gaming lobby.
His router has DMZ enabled.
His Windows XP and Iolo Firewalls are off.
His virus scanner is off.
He cannot join or host games.
He used to be able to join games before his machine needed reformatting.
He used to be able to host games using the IP Switcher.

www.whatismyip.org

does he use such a site when using the IP Switcher?

Damo has used "whatsmyip.org" to ascertain his ip address.

Also we used a program called "VNC" wherein I remotely entered his PC and I used his router's set-up program to check the ip address that was listed there. Both the ip address in the router set-up and "whatsmyip.org" are the same.

Using "VNC" I was the one who performed the DMZ setup. I have helped countless users overcome a multitide of problems but this one is kicking my hindquarters. I have exhausted the realm of my knowledge regarding connection timeout issues and am desperate to get my little buddy playing again.