Every time i try to connect to a server i get the message "Did not receive guest info. Lost connection to host" I would really like to get online so i can unlock the full game. Any help is really appreciated.

You don't need to connect to a server to unlock S2. I thought you just needed to click "Unlock S2" on the main menu..

Anyway, try resetting your modem/router, otherwise it's likely to be a poor connection with your ISP/at your end.

It is not a poor connection on my side. If i buy the game i would like to go online though.

Just search in the technical assistance section for this specific issue and you should be able to find answers.
Without knowing more of your situation, this kind of issue mostly ends up being a firewall issue, not LFS issue. Do you allow LFS to go through your firewall?