WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

问题
重装完linux镜像，在git终端用ssh连接服务器 发现：

$ ssh ubuntu@193.112.133.162
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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 ECDSA key sent by the remote host is
SHA256:WGcYk2Qk0v6fSX4klYH7RlXYRLi/LHzy6LiCUrZasnc.
Please contact your system administrator.
Add correct host key in /c/Users/Administrator/.ssh/known_hosts to get rid of th                        is message.
Offending ECDSA key in /c/Users/Administrator/.ssh/known_hosts:3
ECDSA host key for 193.112.133.162 has changed and you have requested strict che                        cking.
Host key verification failed.

原因

是主机密钥验证失败。
在windows下根据提示进入/c/Users/Administrator/.ssh/
vim编辑.ssh/known_hosts文件，可以看到known_hosts文件保存了本地git和ssh的记录。

解决办法
删除需要连接目标主机的记录，重新使用ssh连接
得到：

$ ssh ubuntu@193.112.133.162
The authenticity of host '193.112.133.162 (193.112.133.162)' can't be established.
ECDSA key fingerprint is SHA256:WGcYk2Qk0v6fSX4klYH7RlXYRLi/LHzy6LiCUrZasnc.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '193.112.133.162' (ECDSA) to the list of known hosts.
ubuntu@193.112.133.162's password:
Welcome to Ubuntu 16.04.1 LTS (GNU/Linux 4.4.0-91-generic x86_64)

问题解决