Conan Exiles dedicated server for playing on your server alone or only with your friends, you need to make your server private so that other players cannot join. Some games allow you to make your server invisible to other players (not public), while in others, you need to create a password for the server, and even if players try to join, they need to know the password to connect.
First, go to the game panel, navigate to the Console section, and shut down the server.
Next, go to the Startup Settings section, where you will see the Server Password line - enter the password that players will use to connect to the server.
IMPORTANT
Do not use a password that you use for other purposes. It's better to create a new one for the server
Player Whitelist
Additionally, you can add players to the Whitelist (a list of players who can join the server without using a password). To do this, you need to be on the server and use the admin panel.
In the player list, select the player you need and click the Whitelist button next to their name. Now, this player will no longer need a password to connect.