Issues Connecting Halo 2 Campaign COOP

my brother and I have been trying to play Halo 2 COOP from separate accounts, however every time we attempt to enter the game my account gets disconnected from our play session. This sometimes happens with the other games (we tried Halo Reach multiplayer and we were fine most of the time). But it still happens. Are there any fixes for this?

Bump on this post!