1.you need to sign into crytek first
2.same with whoever is hosting
3.go to multiplayer then internet
4.if u never signed up
5.it will ask for cd key
6.type anything 1234 or xxxxxxxxx etc.
7.sign up for crytek
8.hit back and go to lan
9.should work
you must log in the game after go back to LAN
kicked from servers because you forgot log in the game
they are many servers will be show up on list when you go back to LAN
have fun