今天一开机登录到另一台机子的时候，出现了如下问题：
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@ WARNING: REMOTE HOST IDENTIFICATION HAS @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING
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Someone could be eavesdropping on you right now (man-in-the-middle attack)!
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It is also possible that the RSA host key has just been changed.
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The fingerprint for the RSA key sent by the remote host is
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4e:d2:94:d9:ce:58:2e:9e:93:7b:33:49:bb:77:e1:dc.
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Please contact your system administrator.
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Add correct host key in /home/sunny/.ssh/known_hosts to get rid of this message.
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Offending key in /home/sunny/.ssh/known_hosts:6
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RSA host key for 192.168.3.118 has changed and you have requested strict checking.
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Host key verification failed.
经过核对之后，自已的操作没有问题。仔细一看英文的错误，然后百度了一下，这个问题很好解决，把~.ssh/known_hosts内容清空一下，重新登录即可。
但这个是为什么呢？
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