On the Auto Config page
- Server Password: asked for when a player joins.
- Public Server: off keeps the server out of the in-game list; friends join by address.
Keep people out
Ban anyone who shouldn't be there. The ban is on their account, so a new character doesn't get around it.
Joining a private server
Friends choose Join Game → Add server and enter the Server Address from the Details tab, then the password. See how friends join.
Questions
Does Valheim have a whitelist?
Valheim can limit a server to listed players, but a password plus bans covers most private servers, and HaruHost's Players page bans and unbans in one click.