Here is some information (in the GrassGames' Cribbage forums) about opening ports:
Opening Ports for Network Games
Opening Ports for Network Games
Re: Opening Ports for Network Games
Note that opening ports is often not possible and/or not needed depending on your internet router or internet setup.
If you constantly get a "cannot open ports" message you can stop the game from trying to open ports in the networking options section in the game.
If you constantly get a "cannot open ports" message you can stop the game from trying to open ports in the networking options section in the game.
Aidan
GrassGames.com
GrassGames.com