问题描述：
fakerdeMacBook-Pro:~ faker$ ssh root@123.***.***.34 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ 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:xv9d+LHzS3VcVK4PVwMcmzoGRQ5ZPqvDGmdJ0CjCB9o. Please contact your system administrator. Add correct host key in /Users/faker/.ssh/known_hosts to get rid of this message. Offending ECDSA key in /Users/faker/.ssh/known_hosts:2 ECDSA host key for 123.***.***.34 has changed and you have requested strict checking. Host key verification failed.
解决方法：
fakerdeMacBook-Pro:~ faker$ ssh-keygen -R 123.***.***.34 # Host 123.***.***.34 found: line 2 /Users/faker/.ssh/known_hosts updated. Original contents retained as /Users/faker/.ssh/known_hosts.old
再次登录成功
fakerdeMacBook-Pro:~ faker$ ssh root@123.***.***.34 The authenticity of host '123.***.***.34 (123.***.***.34)' can't be established. ECDSA key fingerprint is SHA256:xv9d+LHzS3VcVK4PVwMcmzoGRQ5ZPqvDGmdJ0CjCB9o. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '123.***.***.34' (ECDSA) to the list of known hosts. root@123.***.***.34's password: Last login: Fri Jun 1 10:12:55 2018 from 119.29.96.147