It sounds like an AllGoFree bot user or something of the sort, could be some kind of cheat client too; is there only 1 character or is it an SYI attack? If they're flooding your server you really only have to find:
in server.java and change the 5 to a 2, or if it's a cheat client (I'm not familiar with them at all, so excuse me if it seems ludicrous that a cheat client could do such a thing) then make it that only your client can connect to the server (you'll find millions of tutorials on this if you search).Code:if (num > 5) { banHost(host, num); return false; }