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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

SHA256:a1KIrxE7ZGYqR6dRj2YvO3SCIuSSSNulBtZhohY3iaI.

Please contact your system administrator.

Add correct host key in /Users/zhanghainan/.ssh/known_hosts to get rid of this message.

Offending RSA key in /Users/zhanghainan/.ssh/known_hosts:1

RSA host key for 47.94.86.211 has changed and you have requested strict checking.

Host key verification failed.

解决办法：  进入/Users/zhanghainan/.ssh/ 文件夹  

删除 known_hosts 文件