A friend and me are trying to play WWP on a local area network, but we can't connect to each other's games. We see each other in the lobby, and when one of us hosts a game, it shows up on the list of games. Still, when the other player tries to connect to that game, it says it's unable to find the game, and after pressing refresh, both the game, and the hosting player has disappeared from the lobby. What are we doing wrong?

Both of us are running Windows 7, and have yet to experience any problems during single player.