I am playing without mods, all my drivers are up to date, and my game is up to date and the same version as my brother's.
When he creates a game with a password I can see the game, and sometimes join it, but I cannot interact with it at all, and he cannot see me in character arbitration nor can he see any messages I post in the multiplayer chat window.
He is running MacOSX El Capitan, and I am running Windows 10. We are on the same network. We also tried direct connect where he found his wireless IP address in network settings and I typed it into the direct connect window.
I also tried to create a game and have him join, but he could not even see my game in the list of multiplayer games after refreshing several times. I made this one a local network game.
He set his game to listen for join requests and did not make it a local network game
Basically, we would like to get this multiplayer game going, but are having some difficulty. Any help would be appreciated. Thanks in advance.