Lan Issue

[VIM40]

  Greetings fellow Gamers! First time poster, but I've been lurking around as a guest for quite some time. Recently I have coerced my friends into purchasing copies of FFvT3R. When they recieved them in the mail, we got are computers all together and connected with a router. The games showed in the lobby menu, but we could not connect to one another.I found this quite odd as well as distressing.  Does anyone have any knowledge pertaining to LAN issues similar to this? Another asked a similar question a while back, but he was never answered.

Any help will be appreciated, thanks.