you run the trouble shooter, what is causing the network problems, if you could find this out, I may be able to help.
i use a wirless connection to connect the computers in my house to the cable internet. i use internet sharing to get it to the xbox. i use a hub instead of a crossover cable to connect it. in some of the game i try to join it sais i have networking problems, and cant. this always happens with the same hosts of the games. if you have any help please say so.