今天在用终端连接服务器的时候，出现了如下的错误提示：

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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:uzs+5cJWmOXGWTKo4X1OPjfweGxky7jU/bDAhI5NEac.
Please contact your system administrator.
Add correct host key in /Users/jarman/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/guojingman/.ssh/known_hosts:9
RSA host key for 173.22.112.15 has changed and you have requested strict checking.
Host key verification failed.

会出现这个问题是因为，第一次SSH连现时，会生成一个认证，储存在客户端中的known_hosts，但是如果服器端重启后，认证信息也会改变，用原来的客户端连接就会出现如上的错误信息。因此，只要把电脑中的认证信息删除，在此连接后会重新生成，这样就正常啦。要删除很简单，只要在客户端输入命令 ssh-keygen -R 服务器ip 。