ssh 連線出現 remote host identification has changed

原本的 Server IP 已經不是原來的 Server，所以之前初次連線儲存的 key 已不適用，連線時會出現「WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! 」錯誤。

>ssh 192.168.0.2
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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:.............................................
Please contact your system administrator.
Add correct host key in C:\\Users\\xyz/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in C:\\Users\\xyz/.ssh/known_hosts:1
ECDSA host key for 192.168.0.2 has changed and you have requested strict checking.
Host key verification failed.

提示說明可以到使用者目錄底下的 .ssh/known_hosts 進行修改，比較方便的方式是使用 ssh-keygen 直接刪除該 Server IP 的 key 紀錄。

>ssh-keygen -R 192.168.0.2
# Host 192.168.0.2 found: line 1
C:\Users\xyz/.ssh/known_hosts updated.
Original contents retained as C:\Users\xyz/.ssh/known_hosts.old

刪除後，便可以如初次連線一樣，進行連線。

參考：

• https://stackoverflow.com/questions/20840012/ssh-remote-host-identification-has-changed
  verification - ssh remote host identification has changed - Stack Overflow
• https://linux.die.net/man/1/ssh-keygen
  ssh-keygen(1) - Linux man page