ssh error with message “WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!”

I got an error message when ssh to a server like:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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
29:c1:7d:59:83:23:40:fe:3c:ff:e0:b9:a4:d4:49:10.
Please contact your system administrator.
Add correct host key in /home/user/.ssh/known_hosts to get rid of this
message.
Offending RSA key in /home/user/.ssh/known_hosts:24
RSA host key for gpu1.example.com has changed and you have requested strict
checking.
Host key verification failed.
lost connection

How to fix it?

That’s usually because hpc1 changed its public key.

You may run this command

ssh-keygen -R gpu1.example.com

Here, the gpu1.example.com can be replaced with the server domain you are connecting to.

to delete the record of the public key for the server and it will re-download its key.

Answered by Eric Z Ma.

Eric Z Ma

Eric is a father and systems guy. Eric is interested in building high-performance and scalable distributed systems and related technologies. The views or opinions expressed here are solely Eric's own and do not necessarily represent those of any third parties.

Leave a Reply

Your email address will not be published. Required fields are marked *