$ ssh root@XXX
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
cd:d1:ad:98:ca:36:b5:ec:c3:1d:be:b8:8c:ae:bc:80.
Please contact your system administrator.
Add correct host key in /testusr/.ssh/known_hosts to get rid of this message.
Offending key in /testusr/.ssh/known_hosts:144
RSA host key for XXX has changed and you have requested strict checking.
Host key verification failed.
執行下面命令可以解決
$ ssh-keygen -R XXX
/chkusr/.ssh/known_hosts updated.
Original contents retained as /testusr/.ssh/known_hosts.old
說明：
XXX表示你要登錄的服務器IP