WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

Bismillahirrahmanirrahim..

When trying to SSH to another machine and getting the following message and the public key of the remote machine has changed since your last login, you’ll be presented with the following error;

[XX@XX ~]$ ssh root@pong
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
6e:45:f9:a8:af:38:3d:a1:a5:c7:76:1d:02:f8:77:00.
Please contact your system administrator.
Add correct host key in /home/XX/.ssh/known_hosts to get rid of this message.
Offending RSA key in /var/lib/sss/pubconf/known_hosts:4
RSA host key for pong has changed and you have requested strict checking.
Host key verification failed.

Here is the simplest solution
run: ssh-keygen -R <HOST>
example ssh-keygen -R 168.9.9.2

This will update the offending of your host from the known_hosts

Reference: How to fix SSH Remote Host Identification Has Changed error

wassalam.

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