On Fri, 20 Jun 2014 14:21:52 -0400 George Avrunin wrote:
It can also occur with BackupPC when keyless ssh isn't set up right and ssh is giving a prompt (e.g., on the first ssh login to a host). Has happened to me more than once...
Yea, that's the reason you find everywhere when googling, which is why it took me forever to figure out the version incompatibility that gives the same error :-).