the server must be cracked because I looked up sofia9674 on namemc and didn't find anything, which means it wasn't authenticated, which means the server was in offline mode.
Posts by 75r79rfh
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it's probably because your server is in offline mode. (cracked) Turn offline mode off to prevent people like that from logging in.
(NOTE: Offline mode allows any player to log in with any username they choose. This means, unless you banned the username, they could use something offensive like Nintendo or something)