WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

Sian

一、错误提示：

Last login: Thu Jul 24 08:22:08 on ttys001

yusiandeMacBook-Pro:~ yusian$ ssh root@yusian.net

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!    @

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

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

1b:df:79:37:91:ee:9f:1b:c2:c2:14:47:64:4d:f0:9e.

Please contact your system administrator.

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

Offending RSA key in /Users/yusian/.ssh/known_hosts:2

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

Host key verification failed.

二、出现原因：

由于更换了远程主机的操作系统，再次通过ssh登录同一个ip时会出现如上所示提示，网上有很多解决办法，说是删除某个文件或修改某个文件，但容易让人误解成修改服务器，事实上是修改终端本地配置

三、解决办法：

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

这句话已经说得很清楚了，ssh连接是加密的，本地生成的密钥只能应用于某个连接对，现在远程主机更换，ip又没变，所以ssh之前协商好的加密方式不能使用

删除临时文件

rm /Users/yusian/.ssh/known_hosts

搞定！