/etc/resolv.conf being blanked

[Dominic Hargreaves <dom@earth.li>]

[Please CC me on replies]

Hi,

On my freshly installed Debian jessie system, running XFCE and
Network Manager, I'm seeing /etc/resolv.conf being blanked every so
often (it seems to be about every 20 minutes). I can't see what is doing
this; there's nothing in the system logs which correlates with this event.

I can't find anything on the web about this exact situation; plenty
of people talking about NetworkManager overwriting the file
unexpectedly, but not with it being completely blank. Immediately
after NM has activated the connection, resolv.conf is fine.

Does anyone have any thoughts about what might be going on or how to
investigate further?

Cheers,
Dominic.