User blog:Altain21/Problem with GTA IV Multiplayer

One day, about 2 or 3 days ago, I had somekind of update for GTA IV on Xbox. When I played, I couldn't use multiplayer. I could 2 days before. It says that my Gamer Profile does not has the right permissions for Xbox Live to function properly, or something. Is this something to do with my NAT Type being moderate, or something else. Additional info:

I use white Xbox Live, I have TBoGT and TLaD. I have free Xbox Live, I have a moderate NAT Type Linksys modem. That's all