Minecraft online don`t go... read more-scroll down.

Whenever I click on a sign in the online server, the screen solidifies and I can make nothing more. as soon as I the cross on the top right click comes an announcement which registers which does not react the programme any more. after I Minecraft again Restarting, comes the following announcement: it acts to us suffer for the play fall. what should I make against it? the Gommeserver does not go at all. I would be very glad if they could help me. THANKS