S28NetworkManager simply requires that networkmanager be started.  That
does NOT guarantee that you have an active network connection.  The
whole idea behind NM is that it will manage network connection and
disconnect for the system, behind the scenes.

What's happening here is that NM comes up and starts trying to bring the
network up in the background.  In the meantime the init process
continues along to the next item to be started.

This is the major paradigm shift that NM brings in, but unfortunately it
requires that every network service be rewritten to be NM-aware and use
dbus so that they can delay starting up until NM tells them the network
is available.  If they don't do that then there is no way your system
can be robust while using NM.

ypbind has been modified to speak NM, so as long as NM is properly
reporting the network connection status for your system (apparently this
is quite difficult to get right, for whatever reason) then NIS should be
working OK at this point.

However, other network services, most notably autofs (see for example
bug #213574 ), do not speak NM, even today (years after it was
introduced).  So, NM still breaks many enterprise systems.

-- 
NIS has problems starting before the network comes up
https://bugs.launchpad.net/bugs/50430
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