Proxmox WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED

The way to fix this issue is to regenerate all certificates on the node (host) giving this error.

1. Go to the Proxmox GUI and on the left highlight the node.
2. Then select “Shell” on the right.
3. At the prompt run below commands on all affected nodes.

pvecm updatecerts -f

Then run

systemctl restart pvedaemon pveproxy

That’s it.