Halo 3 NAT Problem!

Yeah my NAT is Open, on a Linksys Wrt54g router, but in matchmaking - it always will say 0 games found 0 games avaialble!

Any ideas?

I've got same router and I use to have same problem. uPnP doesn't always work for some reason, sometimes the NAT test will pass with open and sometimes it won't. Just turn off uPnP and forward all them ports wydro mentioned to your 360's IP (port forwarding). Set your 360 with a manual IP also.
 
Bit of a thread hijack but if some1 could help me out it would be great....

Can someone help me out with an online problem please!

I really struggle to find matchmaking games to play online. If a friend is playing then i can join their session in progress with no probs, but if i want to search for a game it is very rare that any other players are found! Iv tried to play all day today and havnt found a single game!

Bit of background, i hook my xbox up to xbox live via my computer using the ethernet cable which comes with the console! Iv switched my firewall and windows firewall off!

In the game, i will go into matchmaking, select the network as social slayer, then begin the matchmakiing! From then on in it just says "looking for players" in all of the slots and at the side it says "Games found; 0" and "Possible matches; 0"

I read somewhere that it could be to do with my NAT settings, but running the connection check through the xbox shows that it is set to open!

So.......does anyboy have any ideas why i cant find a single online game to play? Any input would be MUCH appreciated! Thanks
 
I have noticed that the NAT warning comes up everytime i start matchmaking yet when i go to do the dashboard live test everything is dandy.
Im still getting games so im just going to ignore it for the time being
 
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