Why can't I connect to an xbox live party with my friend even though we both have an open NAT?

Ive already googled it and i cant find a solution. Me and my friend live like 1 black away and we can never connect to eachother on xbox live. I cant join his party, he cant join mine. And we also cant join each others games. We both already checked...

my nat type was moderate but I changed it to open but it still acts as if it was moderate.

Im using a Netgear N900 (WNDR450) and I cant connect to any Xbox Live parties. Xbox says my NAT is on strict however my router says it is open. I have also opened up ports 80, 88, 53, 3074 etc. I have created a unique IP for my Xbox as well but nothing...

Ok so i got live today and was excited until my friend wanted me to join his party, i tried to join and it gave me an error and to test my connection. Which i did and it said that my NAT setting was strict and to follow these steps to fix it. I have...

Me and my friend are trying to play Halo Combat Evolved Aniversary edition, but we cant connect to each other's party. he has the new 360 slim, and i have the original. he's using his wireless, but since i dont have the wireless antenna, i have to bridge...

this is a problem me and a friend have been having lately whenever i try to join his or anything that he starts or whenever he trys to join me it fails it has to be my profile or xbox doing this. idk does anyone have any ideas??

I can't Connect to my Xbox live friend everybody else I can but its just him I cant connect to, If someone else is in the Live Party he can join but as soon as the other friends leaves the party is closed. Please help me I'm getting Tekken 6 and I would...