1.问题：

已经设置了ssh无密码登录，可在使用过程中，可能会出现如下问题：

tyltrinobugdeMacBook-Pro:~ tyltr$  ssh -p 26722 [email protected] 

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@    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

SHA256:3dDIlwt1L3ACU88IqAjPCh0hFMpmiAg+3/qmdKBkVO0.

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Please contact your system administrator.

Add correct host key in /Users/tyltr/.ssh/known_hosts to get rid of this message.

Offending ECDSA key in /Users/tyltr/.ssh/known_hosts:4

ECDSA host key for [104.153.101.34]:26722 has changed and you have requested strict checking.

Host key verification failed

2. 解决方案

注意上述问题中，红字的部分。表明 [104.153.101.34]:26722  的ECDSA host key 出现问题，那么就重新去掉这个有问题的 key就行了。

注意：部分小伙伴的错误提醒中，并没有红字这句话，或者没有直接提示出时哪一个ip的ECDSA host key 出现问题，那怎么办？

好办！

直接查看 .ssh/known_hosts 文件

tyltrinobugdeMacBook-Pro:~ tyltr$ cat /Users/tyltr/.ssh/known_hosts | grep 104.153.101.34

[104.153.101.34]:26722 ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBEa6LASIRwK5dournV59XKYjAQzn9Q1xqyEawg/So7YlW5kQ3MBJJXQfEqstD1x87yNcMDSttQI4PVUirzuSwLQ=

使用命令: ssh-keygen -R  [104.153.101.34]:26722