Me and my brother like to play ARMA 2. He lives in a different house but it is only a few kilometers away. When we try to connect in ARMA 2 OA, It takes a very long time for the game to show up if either of us try to host. When it finally does show up, it says "connection failed."
What is strange is that we can connect perfectly fine in ARMA 2 non-OA.