Cannot connect to xbox live party

Both mine and my friends Xbox 360 have all the ports forwarded, they are both in the DMZ and they both have open NAT. We have no problems joining games, chatting to others or joining other parties yet, we cannot chat to each other or join each others party.

Please don't suggest that it is something to do with the ports, the NAT or the DMZ as I know it isn't.

is anyone else having these issues as I am loathed to call Xbox technical support as they are useless?

Cheers

As I thought, called Xbox Support who narrowed it down to a "communications error between my modem and my friends modem". In other words, we don't know and we are going to blame your ISP.

Problem still ongoing....

Bump

My problem magically fixed itself without me changing anything.

Tried calling the ISP who blamed XBOX. Tried calling XBOX who blamed ISP.

It must have been someones issue as its now resolved.... until next time!

My god, don't 1 post people know that they are bumping super old threads? I think he already solved his problem by now...LustForSoul

Actually, I haven't solved the problem. The problem rectified itself without me doing anything so it still means that if it happens again, I wouldn't have a scooby what to do. Keep posting folks.