错误信息： 
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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 a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
SHA256:6zKiuPSPE90dB6PNCj1fICgA1DTrTxPFiVbl82+sS0E.
Please contact your system administrator.
Add correct host key in /c/Users/xuliugen/.ssh/known_hosts to get rid of this message.
Offending RSA key in /c/Users/xuliugen/.ssh/known_hosts:4
RSA host key for 119.19.19.19 has changed and you have requested strict checking.
Host key verification failed.
解决方式 
// 使用命令清除所连接的IP

ssh-keygen -R XX.XX.XX.XX