[b]Hey. It's probably because you're not patching the game but you just install our Multiplayer Client.
To patch the game you need to download and install patches.
Under "Help" menu on the top of this webpage[/b] - in help section on this website is direct instruction how to patch Crysis to latest version. Check it out.
Here:
http://crymp.net/faq.php (check line: "I have unpatched version of Crysis...")
[b]
Or simply go directly to official Crytek's website and donload patches:[/b]
http://www.crytek.com/games/crysis/overview/download
I think I saw you today listed on my Jump and Fly 5767 - server - after patching you will be able to join other servers too.
Good luck and Have fun.