In a desperate attempt to get the Multiplayer working on my computer (I am getting the "check network connectivity error) I decided to go into the bin folder steam/crysis 2 and use the activation manager manually. Unfortunatly the progress bar gets stuck with about 20% to go and will not budge. could it be that my Key isnt getting to the server, and that is why I cannot log in?

For activation issues, please speak with EA support as they should be able to offer some assistance there.

http://support.ea.com

Also, have you tried this work around for the network connectivity issue: http://www.gamesas.com/forums/viewtopic.php?f=40&t=23112 ?

Thanks!