Re: NetworkManager failing to recognize ethernet connection intermittently in F25 SOLVED, sort of

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On Thu, 5 Jan 2017 15:55:29 -0700
stan <stanl-fedorauser@xxxxxxxxxxx> wrote:

> I've started to have a problem sometime within the last month, where
> on boot I get a message that the ethernet link is up, but when I try
> to use it, sometimes it can't be accessed.

Update - Using Joe and Samuel's suggestions, I booted rawhide and
found that it did not have the problem.  I then looked at journalctl -b
to see how the network aspects of boot differed from f25.  I found that
there was an extra stop and start of NetworkManager.  This triggered my
memory, and I remembered that a long time ago (on different hardware) I
had a problem with NetworkManager and created an rc.local file
in /etc/rc.d with the command 
systemd restart NetworkManager
in it to solve a similar problem.  This was in the rawhide system (it
has been rawhide for quite some time, just continuously bypassing
release status).  I moved it over to the F25 system, and voila, the
problem went away.

The F25 system was installed using BFO when it was still rawhide, and
I didn't completely copy all the little fixes and tweaks I usually do.
It's strange that NetworkManager would suddenly start having a problem,
but it is probably another component change that led to a race, that
NetworkManager loses.

Another anomaly is that I tried a 
systemctl restart NetworkManager 
as root to fix the issue when it happened on the F25 system.  And it
didn't work.  I stopped it, and started it, too.  Also failed.  The
journalctl -b on F25 seemed to show that the network was successfully
started, even though NetworkManager considered it unavailable.

If I feel ambitious, I'll remove the workaround and try to trace the
problem to its source.
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