Tag Archives: SSH

SSH “Host key verification failed” error

There is an annoying error which you get when you want to connect to the same IP via SSH but the server authentication key has been changed and you computer does not accept the risk to connect with a key other than the one you have used before.

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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
xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx.
Please contact your system administrator.
Add correct host key in /home/user/.ssh/known_hosts to get rid of this message.
Offending key in /home/user/.ssh/known_hosts:1
RSA host key for ras.mydomain.com has changed and you have requested strict checking.
Host key verification failed.

This can happen when you install a new OS on the server (or what ever you are trying to connect with via SSH) or if you have completely change the device on the other end (which is also the same case as changing the OS). This error is basically for your own security and safety but it annoys anyway 😀

In this article i’m going to explain few ways to resolve the issue:

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