Warning: Remote Host Identification Has Changed error and solution

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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @

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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

5c:9b:16:56:a6:cd:11:10:3a:cd:1b:a2:91:cd:e5:1c.

Please contact your system administrator.

Add correct host key in /home/user/.ssh/known_hosts to get rid of this message.

Offending key in /home/user/.ssh/known_hosts:1

RSA host key for ras.mydomain.com has changed and you have requested strict checking.

Host key verification failed.

Solution:

$ ssh-keygen -R hostname

Example:

If your hostname is database1.test.com

$ ssh-keygen -R database1.test.com

-R option removes all keys belonging to hostname from a known_hosts file. This option is useful to delete hashed hosts.