When attempting to use the FTP-SFTP conversion, the client may produce the following kind of error message:
FALLBACK TO PLAIN FTP: Key exchange failed. New hostkey or hostkey changed! Please save the key for host: "<hostname or IP-address>"
This indicates that the remote server's host key has not been saved on the client, or it has been saved under a different name. The hostname can occur in 3 different formats: FQDN, short hostname, or IP-address. The host key is always saved under the hostname used in the login.
The FTP-SFTP conversion requires that you have the host key saved under the same hostname as defined in the connection profile, because the FTP-SFTP uses the profiles when connecting to remote hosts.
To avoid unnecessary host-key-changed situations, use the profile name when connecting to a remote host. For example, use the following command syntax to log in from command line: