I can´t join private servers with friends

[locorene21]

Whenever i try to join a friend´s private server i get this error: "ERROR. Unable to join game session" pls help.

[RektInator]

locorene21 This could mean that the game is not allowed through the firewall on the host machine. You can try hosting and have your friend join you instead.

Hosting lobbies usually doesn't work on mobile connections because of limitations from mobile ISPs.

[locorene21]

thanks for your answer, but with my friend we had already tried that but it still won't let us join in private

[IBG922]

I have the same problem as locorene21 , we have given permision in firewall but still nothing and in bo2 multiplayer is even stranger sometimes it works and other times not