We've got 2 Xbox 360's, 2 computers with wireless adapters, and a Linksys wireless router. Both the Xbox's are hardwired to the computers, and the Xbox connection is bridges with the computer's wireless connection. Xbox Live works perfectly on both XBox's. I can use the System Link to create a game on one Xbox, and see the game on the other Xbox, but when my friend tries to join the game, nothing happens for about 30 seconds, and then a message pops up saying the game lobby has been closed. All this while my Xbox, the one that created the game, is working fine and no error messages. How can I resolve this?