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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 a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
fb:d7:5b:d8:c8:20:08:ad:1a:77:32:40:41:3a:16:a0.
Please contact your system administrator.
Add correct host key in /home/valdyn/.ssh/known_hosts to get rid of this message.
Offending RSA key in /home/valdyn/.ssh/known_hosts:12
RSA host key for master.kthread.org has changed and you have requested strict checking.
Host key verification failed.