Christian Weisgerber:

> dpb opens a ControlMaster ssh connection to the remote hosts and
> a multiplexed session for each build job.  By default, sshd limits
> this to 10 sessions.  For more jobs per host, sshd_config needs to
> be tweaked,

And if you set this to the exact number of remote build jobs, very
occasionally ssh will fail to multiplex a session.  Maybe a race
between the termination of an old session and the starting of a new
one.  So I recommend setting MaxSessions a bit higher.

-- 
Christian "naddy" Weisgerber                          naddy@mips.inka.de