Here goes. I have a home network with two xbox's and a labtop. I am have no problem conecting to xboxlive, however there are many rooms I can not join. There used to be only a couple that I couldn't join so I just ignored the problem. Now it seems I can not join anyone on my friends list. I do have a router, but have bypassed the router and hardlined directly to the modem to no resolve. I went out and baought a new router and modem.... same problem. I have re-installed game software..no help. I called the cable compaany ( comcast) and they said my speed was good( upload 440 and download 360). Now I don't know if that is good or not. This is a very frustrating problem and now that I can't fix it, I am on a mission to resolve it. I have heard of opening up ports and port forwarding, but from my understanding that is all router related and like i mentioned I have plugged the ethernet in to the modem directly and reset the modem and have the same problem. If someone knows of anything I can try, please let me know.
any advise appreciated,