Someone could be eavesdropping on you right now (man-in-the-middle attack)!

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[root@JDC2-TMSP-SQL2-NEW etc]# ssh 192.168.20.1
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
c9:58:35:2c:c6:d1:a4:b2:03:be:b1:b0:94:16:b4:e5.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:1
RSA host key for 192.168.20.1 has changed and you have requested strict checking.
Host key verification failed.
[root@JDC2-TMSP-SQL2-NEW etc]#
[root@JDC2-TMSP-SQL2-NEW etc]# scp rsyncd/* 192.168.20.1:/etc/rsyncd
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
c9:58:35:2c:c6:d1:a4:b2:03:be:b1:b0:94:16:b4:e5.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:1
RSA host key for 192.168.20.1 has changed and you have requested strict checking.
Host key verification failed.
lost connection

½â¾ö°ì·¨£ºrm -f /root/.ssh/known_hosts