Hello guys, i've had alot of problems with minecraft's multiplayer 1.0.0, Every time i do try to join a server that works it says. the server answeared with a wrong server key or anything like that, and then it stands that the server is offline, After connecting to several others it does works and then im finnaly loging in.

I've been playing with my friend, he made a server that we was going to play on, but suddenly me and my friend logs in we do get a huge server lag, He was going to make a house, but the blocks did turn around.

So the question is: Are these problems normal :)?