the message is basically saying the known_hosts that your client uses has a tuple that no longer matches this server, usually because the server is presenting a new key to the client, though it could be the same key on a new ip also. Which could be the result of a MITM attack. (key changed) https://serverfault.com/questions/193631/ssh-into-a-box-with-a-frequently-changed-ip (ip changed) https://stackabuse.com/how-to-fix-warning-remote-host-identification-has-changed-on-mac-and-linux/