scp error! Host key verification failed. lost connection

        一、问题：有时候使用scp发送文件到远程服务器，出现如下错误：

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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

5e:49:94:54:c2:28:ef:97:12:88:8f:08:f4:8e:a9:f3.

Please contact your system administrator.

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

Offending RSA key in /root/.ssh/known_hosts:2

RSA host key for 172.19.1.82 has changed and you have requested strict checking.

Host key verification failed.

lost connection

        二、解决方法：清空/root/.ssh/known_hosts 文件。