在重裝系統(tǒng)后出現(xiàn)了這個問題

MacBook-Pro:~ harrytc$ ssh root@ hostname  
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
SHA256:4Tz7f7UkuVF8LaJNRERmAtS0uUNjQj/l1ITvKyxhU7w.
Please contact your system administrator.
Add correct host key in /Users/harrytc/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/harrytc/.ssh/known_hosts:2
ECDSA host key for hostname has changed and you have requested strict checking.
Host key verification failed.

"Host key verification failed" 是指 remote host 的 host key 被改變了。
host keys 存在 ~/.ssh/known_hosts.
你可以edit這個file，把舊的host key刪掉 或者用這個command來

update：ssh-keygen -R hostname

The authenticity of host 'hostname (hostname)' can't be established.
ECDSA key fingerprint is
SHA256:4Tz7f7UkuVF8LaJNRERmAtS0uUNjQj/l1ITvKyxhU7w.
Are you sure you want to continue connecting (yes/no)? yes