$ ssh -l 用户名 XXX.XXX.XXX.XXX
出现以下问题：
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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:JAeh+bV8B7EAb70h4CtddugiALCDmhXSNapc3/6+/+w.
Please contact your system administrator.
Add correct host key in /Users/LiuMingchuan/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/LiuMingchuan/.ssh/known_hosts:7
ECDSA host key for 121.43.169.99 has changed and you have requested strict checking.
Host key verification failed.
解决办法：
$ rm ~/.ssh/known_hosts
转自：SSH连接远程服务器（Linux-Centos）以及出现问题解决
