Quick answer: whitelist on, then whitelist add Name. white-list=true in server.properties.
Back up whitelist.json · Geyser names
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Frequently asked questions (FAQ)
How do I enable the whitelist?
Console: whitelist on, then whitelist add Player. server.properties: white-list=true. whitelist reload.
OP or whitelist?
Whitelist = who may join. OP = admin. Keep them separate.
Geyser/Bedrock names?
Floodgate users often have a prefix. Whitelist the exact name from logs.
Offline mode + whitelist?
offline-mode=true is unsafe. Prefer online-mode + whitelist.