如果我这样做systemctl status sshd，会出现下面的错误，有人可以告诉我如何修复它吗？
Jun 06 20:20:07 pj-server sshd[92565]: Failed password for root from 127.0.0.1 port 47644 ssh2
Jun 06 20:20:07 pj-server sshd[92565]: Received disconnect from 127.0.0.1 port 47644:11: Bye Bye [preauth]
Jun 06 20:20:07 pj-server sshd[92565]: Disconnected from authenticating user root 127.0.0.1 port 47644 [preauth]
Jun 06 20:20:08 pj-server sshd[92567]: Failed password for root from 127.0.0.1 port 47646 ssh2
Jun 06 20:20:08 pj-server sshd[92567]: Received disconnect from 127.0.0.1 port 47646:11: Bye Bye [preauth]
Jun 06 20:20:08 pj-server sshd[92567]: Disconnected from authenticating user root 127.0.0.1 port 47646 [preauth]
Jun 06 20:20:09 pj-server sshd[92585]: Failed password for root from 127.0.0.1 port 47648 ssh2
Jun 06 20:20:09 pj-server sshd[92585]: Received disconnect from 127.0.0.1 port 47648:11: Bye Bye [preauth]
Jun 06 20:20:09 pj-server sshd[92585]: Disconnected from authenticating user root 127.0.0.1 port 47648 [preauth]
Jun 06 20:20:14 pj-server sshd[92592]: error: kex_exchange_identification: Connection closed by remote host