I have 2 Xbox slims. One connects wireless, the other is wired, going thru a Belkin N+ router (firmware up-to-date). Both are on static IPs. All was well BEFORE this update. Both xboxes list NAT as OPEN.
As of today, we can play seperately on different games but when we try to play the same game, it disconnects (usually the wired) one xbox. If one box is on the dashboard and I send an invite to a lobby, the other box will attempt to join but will receive an error stating he can't join. If I send another invite it'll disconnect mines.
Afterwhich, any box that's disconnected will no longer be able to connect. The connection test will say to restart router...wait 30 seconds...etc. After following the suggestion, the box still won't connect though! The only solution is to turn BOTH boxes off and do the 30 sec. router reboot.
Both boxes are able to logon to dashboard together but soon as they both try to go into the same game, one will disconnect. And the process starts over again.
So far this has happened on Crysis 2 and MW3.
Grateful for any thoughts or suggestions.