ssh连接出现Host key verification failed.问题

今天使用ssh远程登录时出现了如下问题：

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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 ECDSA key sent by the remote host is
SHA256:xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Please contact your system administrator.
Add correct host key in xxxx/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in xxx/.ssh/known_hosts:3
ECDSA host key for xxxx has changed and you have requested strict checking.

Host key verification failed.

有点莫名其妙， 会不会是我修改了hosts文件导致的， 注意到Please contact your system administrator.  可能是权限问题， 加上sudo执行， 问题解决