[root@iZ2ze4kh1rvftq4cevdfjwZ ~]# ssh IP
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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:HD+WKR/uzGDGgQxj8npMKtsy/dxvz4Pzn7zP/PwxfMc.
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:
ECDSA host key for 106.12.114.69 has changed and you have requested strict checking.
Host key verification failed.
ssh连接失败，提示 WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!
我之前用这个机器连接过对方机器 但是对方机器重新做了系统
原因：提示中间人攻击，之前连接过该主机未成功，但是写到了known_hosts中。
解决办法：
vi ~/.ssh/known_hosts
删掉根据你连接的主机ip)的记录(一行)，重新连接即可