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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
SHA256:2rAd4Uy45Mm8txcdfvJt7MWhbVVXJG/eZP3R+oCPB3E.
Please contact your system administrator.
Add correct host key in /Users/zhanghao/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/zhanghao/.ssh/known_hosts:3
RSA host key for 192.168.＊.＊ has changed and you have requested strict checking.
Host key verification failed.
 

根據提示的意思我們就可以知道在本地的known_hosts儲存的主機hostkey記錄改變了，該記錄的主鍵可以是所連主機的域名，也可以是所連主機的IP地址。
我們可以進入到該文件刪除對應行，也可以直接用以下的命令直接把known_hosts刪除

rm -rf ~/.ssh/known_hosts