ssh-keygen -R <IP Address>

ssh-keyscan -t rsa <ip address>

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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 a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:XhaMCe+SnuMLGKvCw3tD/kSnYKhvka7e+I0SovLejQ4.
Please contact your system administrator.
Add correct host key in /var/root/.ssh/known_hosts to get rid of this   message.
Offending ECDSA key in /var/root/.ssh/known_hosts:2
ECDSA host key for 46.43.1.145 has changed and you have requested strict checking.
Host key verification failed.
lost connection