scp命令出现Host key verification failed问题

今天在使用scp命令时，出现了如下错误

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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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
b2:c5:a5:c8:d7:87:64:c2:a9:40:68:58:4a:2f:c7:e1.
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:4
RSA host key for 192.168.0.249 has changed and you have requested strict checking.
Host key verification failed.
lost connection

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因为前两天我重装了ssh server，重装之前是可以用的，查了下资料，应该是密钥引起的问题

使用命令ssh-keygen -R hostname即可解决