Problems creating multiplayer game (Command Conquer: Red Alert 3)

They wanted to play with a friend through the tangle ... He connected to my game, everything is fine ... but as soon as the report of the beginning of the round ends, I get (in the game itself) a black screen and an arrow ... after 15-20 seconds a sign appears about the end of the round (or something like that...) Please help!!!
PS - I have 2 computers at home, we play via wi-fi.