Hello,
Ive got my account
but my brother have made a second acound for him, en when trying login on multiplayer there comes a message "username not found".
Could someone help me here ?

Probably typo in somewhere? Or lfs servers are lagging for some reason and it takes a while to update the user..

The account is just made, my account works, or do it have something with 2 computers on the same internet connection?
I hope not

Quote from Josewiet :

The account is just made, my account works, or do it have something with 2 computers on the same internet connection?
I hope not

Nah shouldn't effect

We are 7 guys on a LAN and one of the new guys trying to set up a new account has the exact same problem. Perhaps a problem with the server so new accounts are not added?