Red Alert 3 - Can't play over LAN

Hello Support experts. I and my friend trying to play Red Alert 3 Lan game.

We both have bought serial key (License) and we have same version of the game, because of game was been downloaded from Steam.

When we start game and starting our lobby over Internet we all the time receives same message that is some one have some problem with connectivity so, it's requests to kick him off and then start playing.

So we tired of that, and start to trying to play over LAN.

We located on same lan, we have a good broadband router that supports 100MBits Internet, and we did configured option in game for Lan, IP address (that field was blanked. We did disable firewalls on both computers and when i'm or him are starting Lan Game, Other one of us can't find it...

We just see in list our game Surname or something like that.

What we need to do to solve this problem ?

Does there existed some game command line (startup) or console scripts to make manual connection directly to IP or something ?