if SSH is not enabled on my hosts, my jobs fail with "No conenction could be established because target host explicitly refused it" (rought translation from the original french message).
Last time i had this trouble, i started/Stopped ssh and everything went smooth. However, after last scheduled hosts update, the trick lasted only a few days.
I completely re-installed my hosts when i upgraded from 5.0 to 5.1 .
I'm up to date with VBR (7.0 R2), my hosts are updated properly. My proxies are empty shells VM dedicated to the proxy task.
I wonder what wire i cut to get this

I have enabled ssh and set it to start/stop with hosts, and right now my backup are running, so apart from the annoying message (which i disabled), i'm fine, just curious.