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Remove the offending ssh key

Following error will be displayed when the remote host key changes (after you’ve connected earlier with a valid remote host key).

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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
a7:a8:f2:97:94:33:58:b7:9d:bc:e0:a6:6b:f7:0a:29.
Please contact your system administrator.
Add correct host key in /home/oracle/.ssh/known_hosts to get rid of this message.
Offending key in /home/oracle/.ssh/known_hosts: 6
Permission denied (publickey,password).

You have to remove the key to proceed further. Use the following command to remove the offending key.,

# sed -i '6d' ~/.ssh/known_hosts

Note: Change the 6d according to the line number shown.

Repeat the above process by changing the number until the error message does not appear.

[Reference]
http://www.thegeekstuff.com/2010/04/how-to-fix-offending-key-in-sshknown_hosts-file/