​​问题现象：​​ ssh 远程到远端服务器报错

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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:NHg/pDwRdtQThZzY3Z4Uwq/Rz93FgmL3UdBAFleWFWk.
Please contact your system administrator.
Add correct host key in /Users/yuanting/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/yuanting/.ssh/known_hosts:102
ECDSA host key for 192.168.198.190 has changed and you have requested strict checking.
Host key verification failed.

​​原因：​​

因为服务器的ip发生变更了
第一次SSH连接时，会生成一个认证，储存在客户端（也就是用SSH连线其他电脑的那个，自己操作的那个）中的known_hosts，但是如果服务器验证过了，认证资讯当然也会更改，服务器端与客户端不同时，就会跳出错误.

​​解决办法：​​

输入命令：ssh-keygen -R +服务器的IP
 ssh-keygen -R 服务器的IP