서버열고 클라린빈으로 혼자 접속을 했는데 로그인이 안되어 보니

l1j.server.server.utils.StreamUtil close
심각: Socket closed
java.net.SocketException: Socket closed
        at java.net.SocketOutputStream.socketWrite(Unknown Source)
        at java.net.SocketOutputStream.write(Unknown Source)
        at java.io.BufferedOutputStream.flushBuffer(Unknown Source)
        at java.io.BufferedOutputStream.flush(Unknown Source)
        at java.io.FilterOutputStream.close(Unknown Source)
        at l1j.server.server.utils.StreamUtil.close(Unknown Source)
        at l1j.server.server.ClientThread.kick(Unknown Source)
        at l1j.server.server.ClientThread$ClientThreadIpTimer.run(Unknown Source)
        at java.util.TimerThread.mainLoop(Unknown Source)
        at java.util.TimerThread.run(Unknown Source)

이런식으로 나오는데 이유와 해결 방법좀 알려 주세요. 부탁드립니다~