How to change the server to Non-Premium

Setting the server to non-premium/cracked mode (setting the online-mode parameter to false) allows players to connect to your server without authenticating with Microsoft, which can leave your server vulnerable to attacks. For example, a user could take the nickname of a player with OP privileges in a cracked launcher and log into the server using that player's nickname. Only disable online-mode if you are sure of what you are doing and have additional security measures in place, such as an authentication plugin for players (/register and /login with password).

We recommend reviewing our guide on how to protect your server before disabling online-mode.