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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
3c:2c:9a:2b:08:9b:65:b5:7b:ef:a2:72:92:f1:56:98.
Please contact your system administrator.
Add correct host key in /home/dae/.ssh/known_hosts to get rid of this message.
Offending key in /home/dae/.ssh/known_hosts:1
RSA host key for diogenis.ceid.upatras.gr has changed and you have requested strict checking.
Host key verification failed.