查看日志：
tail -f /var/log/auth.log
May 25 15:55:13 121 sudo: pam_unix(sudo:session): session opened for user root by root(uid=0)
May 25 15:55:13 121 sshd[550561]: Received signal 15; terminating.
May 25 15:55:13 121 sshd[922866]: Server listening on 0.0.0.0 port 22.
May 25 15:55:13 121 sudo: pam_unix(sudo:session): session closed for user root
May 25 15:55:16 121 sshd[922867]: Authentication refused: bad ownership or modes for directory /home/gaoithe
May 25 15:55:17 121 sshd[922867]: Failed password for gaoithe from port 37180 ssh2
May 25 15:55:18 121 sshd[922867]: Connection closed by authenticating user gaoithe port 37180 [preauth]
May 25 15:55:20 121 sshd[922870]: Authentication refused: bad ownership or modes for directory /home/gaoithe
May 25 15:55:20 121 sshd[922870]: Connection closed by authenticating user gaoithe port 37192 [preauth]
May 25 15:55:42 121 sshd[922894]: Authentication refused: bad ownership or modes for directory /home/gaoithe
May 25 15:55:46 121 sshd[922894]: Connection closed by authenticating user gaoithe port 55854 [preauth]
可以看到可能是用户目录所有权出错，或者用户目录权限不正确：
sudo chown -R gaoithe:gaoithe /home/gaoithe
chmod 755 /home/gaoithe
sudo systemctl restart sshd
即可连接
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