Please contact your system administrator. Add correct host key in /Users/*******/.ssh/known_hosts

macOS系统下ssh root@hostname时遇到如下问题的解决方案：

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
The RSA host key for********.com has changed,
and the key for the corresponding IP address ****
is unknown. This could either mean that
DNS SPOOFING is happening or the IP address for the host
and its host key have changed at the same time.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
************************.
Please contact your system administrator.
Add correct host key in /Users/***/.ssh/known_hosts to get rid of this message.
Offending key in /Users/*/.ssh/known_hosts:1
RSA host key for************** has changed and you have requested strict checking.
Host key verification failed.

方法1：使用TextMate之类的文本编辑器打开～/.ssh/known_hosts的文件，把hostname对应的行删掉（行首就是你的hostname了，注意：这里的行通常很长，编辑器可能会自动换行。找不到对应的行就全删了也没关系，怕出问题的话可以先备份一下），重新执行命令即可。

方法2：使用命令行工具（推荐iTerm）执行ssh-keygen -R hostname即可

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Please contact your system administrator. Add correct host key in /Users/***/.ssh/known_hosts

Please contact your system administrator. Add correct host key in /Users/*******/.ssh/known_hosts

macOS系统下ssh root@hostname时遇到如下问题的解决方案：

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