Do not automatically disconnect after the scary message:

Do not automatically disconnect after the scary message:
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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 RSA1 host key has just been changed.
The fingerprint for the RSA1 key sent by the remote host is
XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX.
Please contact your system administrator.
Add correct host key in /home/XXXXXXXX/.ssh/known_hosts to get rid of this message.
Offending key in /home/XXXXXXXX/.ssh/known_hosts:XX
RSA1 host key for XXXXXXXXXXXX has changed and you have requested strict checking.
Host key verification failed.

It may still proceed afterwards.