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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
Please contact your system administrator.
Add correct host key in /Users/user/.ssh/known_hosts to get rid of this message.
Offending key in /Users/user/.ssh/known_hosts:7
RSA host key for 127.0.0.1 has changed and you have requested strict checking.
Host key verification failed.
-keygen -R 127.0.0.1 IP换自己的服务器就可以了，简单吧！