Network error CS GO (Counter-Strike: Global Offensive)

In the morning my friend wanted to play the COP, but he's in the game was written kik MEX,All the custom servers were turned off, but the entrance was open on BETA servers, Valve. What to do?

Steam friend http://steamcommunity.com/profiles/76561198280083280
My steam http://steamcommunity.com/id/disabro/