mac机器

bogon:~ mac$ ssh -p **22 root@**.*********.org

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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 RSA key sent by the remote host is
SHA256:P73YH4G4Eedj7XrvYAmAst3/qtUS5E1WL8Dm8vUzDD8.
Please contact your system administrator.
Add correct host key in /Users/mac/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/mac/.ssh/known_hosts:34
RSA host key for [**.*********.org]:**22 has changed and you have requested strict checking.
Host key verification failed.

根据提示的意思我们就可以知道在本地的known_hosts保存的主机hostkey记录改变了，该记录的主键可以是所连主机的域名，也可以是所连主机的IP地址。 
我们可以进入到该文档删除对应行，也可以直接用以下的命令直接把known_host

rm -rf /Users/mac/.ssh/known_hosts