Type `help' to learn how to use Xshell prompt.
[c:~]$
Connecting to 20.0.0.91:22...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.
Last login: Fri Nov 1 12:36:08 2019 from 10.0.1.25
Connection closed by foreign host.
Disconnected from remote host(20.0.0.91) at 12:38:43.
Type `help' to learn how to use Xshell prompt.
操作：
vim /etc/ssh/sshd_config
#UseDNS yes
改为
UseDNS no
重启sshd
service sshd restart