Yeah man!!! Last night I try too connect Xbox Live!! So I can able to connect it through Xbox Live!! .
I do not have to perform the following steps to connect...
"2) You MUST check your firewall.. one day i went through alot of messed up settings and was willing to pull my hair and kept thinking why my Live wasn't working properly until i realized i had two firewalls on, one the windows vista one as well as the Norton Internet security.. so make sure you turn off both and check.. if it works than keep one on and than check again
3) A little risky but go ahead and enable DMZ.. that should work and remove NAT restrictions"
I just open the following Ports:
TCP 80 (TCP 81 instead of TCP 80)And enable UPnP (universal plug an play).
that's all i have done to enable Xbox Live Gaming on Mobilink Infinity WiMAX. They do not disclose the password of the device but they help in real manner.
Thank You Guys!!