The whitelist is a list of players allowed to join the server. When it's enabled, only the players on it can connect — everyone else is rejected automatically.
There are two ways to enable it:
server.properties file: in the Files tab, edit the file and change the field:
white-list=false
change it to
white-list=true
whitelist on
In the server console, use:
whitelist add <player_name>
Example:
whitelist add Steve123
whitelist remove <player_name>
To see all allowed players:
whitelist list
whitelist.json file in the Files tab — handy for adding several players at once.
To stop a player from joining the server (regardless of the whitelist):
ban <player_name> <reason>
Example:
ban Steve123 Toxic behavior in chat
To ban by IP (prevents the person from joining with another account):
ban-ip <ip_address>
pardon <player_name>
pardon-ip <ip_address>
Unlike a ban, a kick only removes the player from the server right now, without stopping them from joining again:
kick <player_name> <reason>
OP (operator) gives the player access to the server's administrative commands.
op <player_name>
To remove it:
deop <player_name>
You can check the lists directly in the files in the Files tab:
banned-players.json — list of banned players.banned-ips.json — list of banned IPs.ops.json — list of operators.whitelist.json — list of whitelisted players.