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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 the RSA host key has just been changed.

The fingerprint for the RSA key sent by the remote host is

84:03:5f:cb:ab:3e:81:54:12:ed:b8:1e:03:4b:62:ad.

Please contact your system administrator.

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

Offending key in /root/.ssh/known_hosts:11

RSA host key for 192.168.3.123 has changed and you have requested strict checking.

Host key verification failed.

1、解决方法如下

ssh root@192.168.1.56的时候出现如上图的提示，说明原先/root/.ssh/known_hosts文件中已经记录了，当前连接的信息，只需要清空.ssh/known_hosts文件中的信息即可正常访问

cat /dev/null >/root/.ssh/known_hosts