Friend is unable to join my game or any server.

[Wubbahead]

Hi all, so my friend and I were sick of bo2 servers either crashing our games or kicking us out of games randomly. So we decided to try plutonium, but every time he tries to join a game he gets the error "assertion failed" or "waiting for other players." He is on Fedora and I'm on OpenSuse with no issues.

Thanks for the help!