Ubuntu 12.10
Linux eb 3.5.0-27-generic #46-Ubuntu SMP Mon Mar 25 20:00:05 UTC 2013 i686 i686 
i686 GNU/Linux
USB modem:  Product: Vertex Wireless Multi-Function Device

The connection is OK but after every 50 minutes the modem hangups:

May  3 15:36:05 eb pppd[3589]: LCP terminated by peer
May  3 15:36:05 eb pppd[3589]: Connect time 51.1 minutes.
May  3 15:36:05 eb pppd[3589]: Sent 1768732 bytes, received 55238638 bytes.
May  3 15:36:09 eb pppd[3589]: Connection terminated.
May  3 15:36:09 eb NetworkManager[1189]: <info> (ttyACM0): device state change: 
activated -> failed (reason 'ip-config-unavailable') [100 120 5]
May  3 15:36:09 eb avahi-daemon[1159]: Withdrawing workstation service for ppp0.
May  3 15:36:09 eb NetworkManager[1189]: <info> Unmanaged Device found; state 
CONNECTED forced. (see http://bugs.launchpad.net/bugs/191889)
May  3 15:36:09 eb NetworkManager[1189]: <warn> Activation (ttyACM0) failed for 
connection 'UFON 910 045 174'
....

Sometimes the modem falls out after some minutes:
May  3 15:40:24 eb NetworkManager[1189]: <info> Unmanaged Device found; state 
CONNECTED forced. (see http://bugs.launchpad.net/bugs/191889)
May  3 15:41:14 eb pppd[5438]: Modem hangup
May  3 15:41:14 eb pppd[5438]: Connect time 4.1 minutes.
May  3 15:41:14 eb pppd[5438]: Sent 141041 bytes, received 1393940 bytes.
...

On another netbook with Ubuntu 12.04 LTS this modem runs many hours without 
problems.
See Attachment for syslog


** Attachment added: "syslog"
   
https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/191889/+attachment/3663825/+files/syslog

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https://bugs.launchpad.net/bugs/191889

Title:
  [MASTER] [WORKAROUND] "Offline Mode" feature fails to detect proper
  online state for networks that are managed outside of network manager.

Status in The Mozilla Firefox Browser:
  Fix Released
Status in NetworkManager:
  New
Status in ntrack - Network Connectivity Tracking library for Desktop 
Applications:
  Invalid
Status in USB ADSL Modem Manager for Gnome, written in Python:
  New
Status in “empathy” package in Ubuntu:
  Fix Released
Status in “evolution” package in Ubuntu:
  Invalid
Status in “firefox-3.0” package in Ubuntu:
  Fix Released
Status in “network-manager” package in Ubuntu:
  Invalid
Status in “network-manager-applet” package in Ubuntu:
  Fix Released
Status in “pidgin” package in Ubuntu:
  Fix Released
Status in “empathy” source package in Hardy:
  Invalid
Status in “evolution” source package in Hardy:
  Invalid
Status in “firefox-3.0” source package in Hardy:
  Fix Released
Status in “network-manager” source package in Hardy:
  Invalid
Status in “network-manager-applet” source package in Hardy:
  Invalid
Status in “pidgin” source package in Hardy:
  Invalid
Status in “empathy” source package in Intrepid:
  Fix Released
Status in “evolution” source package in Intrepid:
  Invalid
Status in “firefox-3.0” source package in Intrepid:
  Invalid
Status in “network-manager” source package in Intrepid:
  Won't Fix
Status in “network-manager-applet” source package in Intrepid:
  Fix Released
Status in “pidgin” source package in Intrepid:
  Fix Released
Status in Baltix GNU/Linux:
  Fix Released

Bug description:
  Binary package hint: firefox-3.0

  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=8.04
  DISTRIB_CODENAME=hardy
  DISTRIB_DESCRIPTION="Ubuntu hardy (development branch)"
  Firefox 3.0b3
  When I start firefox from the panel it always start in offline mode. I am 
connected via wireless to a network that is always on. When I want to browse I 
need to unclick "work offline"

  Workaround 1: (since ffox 3.0.1) ->
   set toolkit.networkmanager.disable to false in about:config

  Workaround 2: (make NM to be always online) ->
   add a non existing interface to /etc/network/interfaces, like:

  iface eth1000 inet dhcp

To manage notifications about this bug go to:
https://bugs.launchpad.net/firefox/+bug/191889/+subscriptions

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