Check in order: server started, correct address with the port, same Minecraft version, whitelist, and an official Minecraft account if online-mode=true.
"Online" status on the service page.
Full address (
IP:portor subdomain).Same version on the player's side as the server's (and the same mods for a modded server).
Whitelist active? Add the player with
whitelist add Username."Failed to verify username" message: the player doesn't have an official Minecraft account. To let them in anyway, follow the enable cracked mode fiche.
Common errors
- "Connection refused: getsockopt": the server isn't started, or the port is wrong. Start it from the GamePanel (after an order, it isn't running until you start it for the first time) and double check the exact address and port on the service page.
- "Connection timed out: getsockopt": the address isn't responding. Check the IP and the port; if only one player is affected, have them try over a 4G or 5G mobile hotspot to see if their router or network is filtering the connection.