I have had the same ISP (Time Warner) and the same wireless router for a couple of year now and I have never had any issues connecting to the internet or XBox live using a wireless connection. Now I get a message from XBox live I cannot connect until I apply an update, but the update continually fails. When I troubleshoot I get either IMCP message or DNS messages from XBox. I've updated my firmeware in router the latest (LinkSys Router WRT54GS). Rest up eveything but still no joy with connecting through the internet with my XBox. All other devices (laptiops, ipHones, Android tablets) connect just fine to the internet. It appears Microsoft has changed something and has my now in a catch 22 situation where I cannot connect to XBox live unless I apply an update, but I can't apply the update because Microsoft change something that will not allow me to connect to the internet or Xbox live.. So I followed the instructions for manually downloading and applying the currenct update for XbOx.. Now my Xbox just sits there with the XBox logo displaying, sio it appears I gone from bad to worse. Just another example of how Microsoft can take something was working and throw some complication in there to make it break.
Has anyone else run into this issue of being able to connect with no problems to being unable to connect becuase of either IMCP, DNS issues, or both?