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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 RSA key sent by the remote host is
59:4a:a3:c6:84:76:27:42:66:3e:fd:30:31:4b:cb:8b.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:22
RSA host key for 192.168.4.88 has changed and you have requested strict checking.
Host key verification failed.

使用SSH连接服务器出现如上报错，原因是地址密钥存在，于当前连接机器信息不符，删除请求端上的/root/.ssh/know_host文件中相应地址段落