ssh 192.168.1.88 出现以下警告：
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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:Rf81ie6kn6C04O3fJKR3YyJ1ApVmIxwTo8zhZ+sbsjY.
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:4
ECDSA host key for 192.168.1.88 has changed and you have requested strict checking.
Host key verification failed.
删除 /root/.ssh/known_hosts 文件中对应IP的那一行即可
ssh WARNING:REMOTE HOST IDENTIFICATION HAS CHANGED(警告:远程主机标识已更改)
原文：http://www.cnblogs.com/my-cnblogs-com/p/7767727.html