Why can't i find any matches on matchmaking for halo 3?

[nate]

When I try to play multiplayer online and I go to matchmaking and search for a game, it finds hundreds of games but none are possible matches. It does this on ranked, social, and basic training. Help please!!

 

[DeadlyH0ur]

Does it say your NAT settings are too strict?

if so go to Bungie.net

i think that's where you go if you have that problem.