I have done it exactly how it says on that website. I do not think it is a Firewall issue. I have tried

Both firewalls off
Windows firewall off, router firewall on with ports forwarded
windows firewall on, router firewall off
windows firewall on ports forwarded, router fire on ports forwarded,

I have tried this on all three computers on the network. I have noticed that i can connect from first thing in the morning, till about 11am GMT, which is the time the americans will be waking up. I was wondering if that has anything to do with it