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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 ECDSA key sent by the remote host is
Please contact your system administrator.
Add correct host key in /home/ebara/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/ebara/.ssh/known_hosts:27
ECDSA host key for ... has changed and you have requested strict checking.
Host key verification failed.
vi ~/.ssh/known_hosts
該当行を削除。