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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
2b:2c:dd:99:a8:1f:a6:e2:b1:59:0d:5d:40:04:df:21.
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 videoapi3 has changed and you have requested strict checking.
Host key verification failed.
videoapi3代表主机名
简单的解决办法 ：
删除/root/.ssh/known_hosts 中对应的主机记录，重新用ssh连接下就可以了