Nat Problems xbox360

I cant join my friends but my nat is on open,what can u do now?please help me

Are you still experiencing this issue? What type of game mode do you want to join? I would suggest looking here for help. Oh and here.

> 2535444941139412;1:
> I cant join my friends but my nat is on open,what can u do now?please help me

Is this just in Halo, or other games as well?