Sometimes, after migrating hosts or servers, your Host's SSH Key will change. For security reasons, SSH/SFTP will report errors such as
Host key verification failed or, in some SFTP applications,
Unknown Fingerprint Error - SSH. This is expected and normal. It is also easy to resolve.
To begin, in
Go To Folder at the top of your screen
~/.ssh in the window at the top of your screen to open the
known_hosts file to the trash. A new
known_hosts file will be created for you the next time it's required.