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[ThorstenK <tkundoch@xxxxxx>]

** Changed in: cups (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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

Title:
  CUPS web interface stops responding after a while

Status in cups package in Ubuntu:
  Fix Released
Status in cups source package in Xenial:
  Fix Released

Bug description:
  after 6 minutes or so, cups is not responding.
  it do not produce error on the log, just stop working, worse, it exit with 0

  ⌌—————————————————————————————————————————————————————————————————————————————————————⌍
  |root@cupsmachine :~# systemctl status cups                                           |
  |● cups.service - CUPS Scheduler                                                      |
  |   Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: enabled)|
  |   Active: inactive (dead) since ven. 2016-07-01 10:31:32 TAHT; 2min 16s ago         |
  |     Docs: man:cupsd(8)                                                              |
  |  Process: 28686 ExecStart=/usr/sbin/cupsd -l (code=exited, status=0/SUCCESS)        |
  | Main PID: 28686 (code=exited, status=0/SUCCESS)                                     |
  |                                                                                     |
  |juil. 01 10:30:01 appli-client systemd[1]: Started CUPS Scheduler.                   |
  ⌎—————————————————————————————————————————————————————————————————————————————————————⌏

  I got to launch it again, so I have finish with a cron job like
  */10 * * * * systemctl status cups.service|grep -q 'inactive (dead)' && systemctl start cups

  but it is a dirty solution. I have no idea of what make it stop.
  NB: I have seen problems related to apparmor, this machine has no apparmor package.

  [Impact]

  If you want to use the CUPS web interface in Xenial and therefore set
  "WebInterface Yes" in /etc/cups/cupsd.conf, CUPS could auto-shutdown
  when it is idle and then an attempt to access http://localhost:631/
  via a web browser fails. People get confused as other access to CUPS

  [Testcase]

  Take a CUPS setup on Xenial with no shared print queues and CUPS only
  listening on the domain socket. Activate the web interface via

  cupsctl WebInterface=Yes

  Now you are able to access the web interface via
  http://localhost:631/. Wait for some minutes without accessing CUPS
  until the CUPS daemon shuts down automatically. Try to open the web
  interface again and it will not work.

  With the fixed CUPS package CUPS will not auto-shutdown when the web
  interface is activated.

  [Regression Potential]

  Low, as we are removing a simple distro patch to get back to the
  original, upstream behavior.

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