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更换登录方式后无法登录的解决方法

更换登录方式后无法登录的解决方法
2017年11月16日
11:48
触发场景：
  1. 重装系统，登录方式或密钥密码均不变。登录失败。提示如下
  2. 更换登录方式，比如从密钥登录变为密码登录。提示也一样。
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
c4:4e:a1:56:ad:32:a0:c5:90:03:4e:b8:a9:ef:e4:a0.
Please contact your system administrator.
Add correct host key in /usr/local/app/.ssh/known_hosts to get rid of this message.
Offending RSA key in /usr/local/app/.ssh/known_hosts:20
RSA host key for [111.230.197.74]:36000 has changed and you have requested strict checking.
Host key verification failed.
 
原因：这两种情况都会导致登录客户端的~user/.ssh/known_hosts文件中对应的ip的信息发生变化。如果不删除这段旧信息，登录就会用这段信息去登录，导致信息不匹配而失败。
解决方法：删除登录客户端的~user/.ssh/known_hosts文件中更改过的ip的信息。
 
已使用 Microsoft OneNote 2016 创建。