This is a very serious bug that breaks network printing in certain
configurations. To be clear: its not just that cups stops and the web
interface is unavailable -  it can lead to not being able to print as
the print server looks like it is offline to the clients:

D [09/Feb/2017:10:07:02 -0600] [Job 12] Connection error: Transport endpoint is 
not connected
E [09/Feb/2017:10:07:02 -0600] [Job 12] The printer is not responding.


I was running into this issue on some print servers but not others and in 
comparing the two cupsd.conf files I found out I can prevent the issue by 
changing
BrowseLocalProtocols CUPS
to 
BrowseLocalProtocols dnssd


The real problem here is that a feature like this should have a clear and easy 
way to turn if off completely.  I don't ever want cups on a print server 
stopping to save an insignificant amount of cpu cycles or memory or 
electricity!  


Applying the packages from xenial-proposed does fix it for me, but in my 
opinion this is a pretty serious issue that needs a quicker fix.

I think the best fix at the moment is the suggestion from Andreas Krausz
(kukorica)  to change " the option "-l" to "-f" in
/lib/systemd/system/cups.service."  as it seems that is the only way to
turn off this "feature".

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https://bugs.launchpad.net/bugs/1598300

Title:
  CUPS web interface stops responding after a while

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