Board Thread:News and Announcements/@comment-26281589-20130808174513/@comment-17727644-20130914030604

Alright then. Is this minecraft or Steam itself? If it's mine-craft, it looks like your game version or contents do not match whatever settings the server has which is why it boots you. Kindof like... the server has dragons but you don't have the mod for dragons installed.

If it's for steam the game client - let me know.