ssh接続しようとしてできない時

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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
41:00:9d:32:17:69:ec:05:f0:b1:5b:80:cc:1e:21:29.
Please contact your system administrator.
Add correct host key in /Users/yakko_tofu/.ssh/known_hosts to get rid of this message.
Offending key in /Users/yakko_tofu/.ssh/known_hosts:15
RSA host key for 54.250.121.171 has changed and you have requested strict checking.
Host key verification failed.

上記みたいなエラーが出たら、下記のknown_hostsで使わなくなったアドレスを消すとOK

~/.ssh/known_hosts

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