This is done after first connecting to the server, and will prompt you with a message like this: $ ssh When you connect to a server via SSH, it gets a fingerprint for the ECDSA key, which it then saves to your home directory under ~/.ssh/known_hosts. Offending ECDSA key in /Users/scott/.ssh/known_hosts:47ĮCDSA host key for has changed and you have requested strict checking. Please contact your system administrator.Īdd correct host key in /Users/scott/.ssh/known_hosts to get rid of this message. SHA256:hotsxb/qVi1/ycUU2wXF6mfGH++Yk7WYZv0r+tIhg4I. The fingerprint for the ECDSA key sent by the remote host is It is also possible that a host key has just been changed.

Someone could be eavesdropping on you right now (man-in-the-middle attack)! Because of this, there are quite a few checks built-in to the popular SSH clients, like OpenSSH, that ensure your connection can't be compromised.Īn example of one of these checks is the following, which identifies when the fingerprint of a server has changed: $ ssh WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! It aims at ensuring that your connection, and therefore all data passed, is free from eavesdropping. SSH, or Secure Shell, is a very common way to securely access remote machines, typically via the command line.

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