[Bug 1772692] Re: vpnc hangs, if avahi-daemon installed

[Launchpad Bug Tracker]

*** This bug is a duplicate of bug 1752411 ***
    https://bugs.launchpad.net/bugs/1752411

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: bind9 (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1772692

Title:
  vpnc hangs, if avahi-daemon installed

Status in avahi package in Ubuntu:
  Confirmed
Status in bind9 package in Ubuntu:
  Confirmed
Status in vpnc package in Ubuntu:
  Confirmed

Bug description:
  My vpnc configuration stopped working correctly after an upgrade from
  16.04 to 18.04.

  
  Symptoms are:

  When starting vpnc with:

  $ sudo vpnc-connect myconfig

  vpnc hangs without a working vpn connection. Pressing Ctrl-C once,
  will output the line

  ^CVPNC started in background (pid: 19352)...

  and vpn suddenly works.

  Hint: Pressing Ctrl-C twice is bad, as that exits vpnc without a working vpn
  connection. And it changes the routing table and /etc/resolv.conf, so that
  normal internet is also not working correctly. I found the Ctrl-C workaround
  by accident.

  
  Further examination revealed, that vpnc seems to hang inside the following script:

  /usr/lib/avahi/avahi-daemon-check-dns.sh

  which comes with the avahi-daemon package.

  I also discovered, that there is a 'host' process hanging. So, the above script
  seems to hang in line 76:

    OUT=`LC_ALL=C host -t soa local. 2>&1`

  'host' is part of the bind9-host package.

  
  Currently, I simply deinstalled avahi-daemon. Luckily, I don't need that package.

  
  I'm not sure, which package is to blame for this bug, my candidates are (in this
  order):

  bind9-host
  avahi-daemon
  vpnc

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