HI,

In my lan environment i've configured a server with rhel5 and a desktop with fc12.I was unable to ssh between rhel5 & fc12. when i'm trying to login through ssh i was getting following error

#ssh admin@x.x.x.x
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
b4:fc:8b:09:91:e6:7a:f9:ed:b0:98:da:68:f3:d2:04.
Please contact your system administrator.
Add correct host key in /home/admin/.ssh/known_hosts to get rid of this message.
Offending key in /home/admin/.ssh/known_hosts:12
RSA host key for x.x.x.x has changed and you have requested strict checking.
Host key verification failed.

can any one help me regarding this.

Thanks in advance.

rm /home/admin/.ssh/known_hosts

Or you can edit the file and delete the line that contains that IP address

I tried with this then also i was getting the same error.