
As (almost) all of you know, there are 3 options about the NAT ports:
1) all ports open
2) 50-50
3) strict connection
Nr. 3 guys can just play against Nr. 1 guys. Since i joined xboxlive in May 2009 i was a **** Nr. 3.
I did call xbox more than once and they gave me the numbers (TCP and UDP) for open the ports...but it never worked.
Now the journey comes to an end. The reason if you can open all your NAT ports is not about the TPC and UDP numbers, it s about this one:
http://en.wikipedia.org/wiki/DMZ_%28computing%29
DMZ
If your router doesn t have a manual DMZ, you can forget it.
My provider "Vodafone" produced routers named "Easy Box". My version is 602...the first without DMZ.
If you want to play xboxlive without problems, don t buy a router without DMZ!
Unfortunately, all new routers from vodafone (602 and now the 800 series) don t have it, so - if you want to buy an "easy box" - you need to get an older version (until 601, not 602 - 801/802!!! etc).
I got a 601 via ebay for 1 Euro and next week my NAT problem should be history.

Ok...maybe not that much interesting for ITST...but maybe good for 1-2 guys which have that NAT port problem as well.