Support,
i think one piece missing from the list of questions/answers here is in regards to the restoration side of it. If the OP has used the SFTP connection on Server A, backs up the config, and then restores it on Server B, does the key file need to exist as it's the first time Server B has used the connection? or because it's a restoration of Server A, it already has it and Server B is fine?
Just looking for clarification.
Brian