1. ssh远程登录警告提示信息如下：
$ ssh [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:Hz9lI5FK/x7MZ758HExCNqGML5PeDUkpxTSuCHVvZ74.
Please contact your system administrator.
Add correct host key in /Users/xubinbin/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/xubinbin/.ssh/known_hosts:9
ECDSA host key for 192.168.162.136 has changed and you have requested strict checking.
Host key verification failed.
2. 问题原因：
It is also possible that a host key has just been changed.
可能由于主机的SSH公钥改变了，导致公钥认证失败，比如系统重新装机等情况可能导致出现这样的情况；
3. 解决方式1：
通过 ssh-keygen 密钥工具更新
ssh-keygen -f ~/.ssh/known_hosts -R 192.168.162.136
$ ssh-keygen -f ~/.ssh/known_hosts -R 192.168.162.136
# Host 192.168.162.136 found: line 9
/Users/xubinbin/.ssh/known_hosts updated.
Original contents retained as /Users/xubinbin/.ssh/known_hosts.old
4. 解决方式2：
以编辑器的方式进入这个文件，手动清楚ssh公钥信息
vi ~/.ssh/known_hosts
删除之前获取的ssh公钥信息（删除下面红框内信息），重新连接，建立新的连接，或取新的公钥；
