During two days I was not able to play on any crysis2 servers. I had the messages "conection lost" OR "you have been kicked".

I just post to say that my problem has been solve thanks to a friend who lent me his crysis account 10 minutes.
Thanks to him, I was able to reach a server with my CD key and his account.
Since, I can play with my CD key and my account.

I suppose it was a damaged file which was repaired during the first the conection.

I hope it can help...

EDIt = and Crysis 2 does not ask me my multiplayer key when I launch the game