Network Manager issue - Vodafone Mobile Connect and PPP problems

Network Manager PPP bug

The setup:

OS: Ubuntu 9.04
3G modem: Huawai K3520
Service: Vodafone Mobile Connect (Vodafone Romania)

The issue: All VMC (Vodafone Mobile Connect) and modem settings are OK but the
           connection is terminated after only 0.2 minutes (see the log output).


The output of the system log before fixing this bug:

Sep 25 00:11:39 lnx pppd[13933]: Plugin /usr/lib/pppd/2.4.4/nm-pppd-plugin.so loaded.
Sep 25 00:11:39 lnx pppd[13933]: pppd 2.4.5 started by root, uid 0
Sep 25 00:11:39 lnx pppd[13933]: Using interface ppp0
Sep 25 00:11:39 lnx pppd[13933]: Connect: ppp0 <--> /dev/ttyUSB0
Sep 25 00:11:39 lnx pppd[13933]: No CHAP secret found for authenticating us to UMTS_CHAP_SRVR
Sep 25 00:11:42 lnx pppd[13933]: No CHAP secret found for authenticating us to UMTS_CHAP_SRVR
Sep 25 00:11:42 lnx pppd[13933]: CHAP authentication succeeded
Sep 25 00:11:42 lnx pppd[13933]: CHAP authentication succeeded
Sep 25 00:11:46 lnx pppd[13933]: Could not determine remote IP address: defaulting to 10.64.64.64
Sep 25 00:11:46 lnx pppd[13933]: local  IP address 10.80.215.26
Sep 25 00:11:46 lnx pppd[13933]: remote IP address 10.64.64.64
Sep 25 00:11:46 lnx pppd[13933]: primary   DNS address 193.230.161.3
Sep 25 00:11:46 lnx pppd[13933]: secondary DNS address 193.230.161.4
Sep 25 00:11:54 lnx pppd[13933]: Terminating on signal 15
Sep 25 00:11:54 lnx pppd[13933]: Connect time 0.2 minutes.
Sep 25 00:11:54 lnx pppd[13933]: Sent 0 bytes, received 0 bytes.
Sep 25 00:11:54 lnx pppd[13933]: Connection terminated.
Sep 25 00:11:54 lnx pppd[13933]: Exit.

How to make your broadband connction to work:

There are three steps to follow.

1. Locate and remove the following section in /etc/dbus-1/system.d/NetworkManager.conf:
<deny send_destination="org.freedesktop.NetworkManager"          
      send_interface="org.freedesktop.NetworkManager.PPP"/>

2. Restart the NetworkManager
/etc/init.d/NetworkManager restart

3. Close all the consoles where you logged as root or as sudo su! 

No, it's not a joke, that's the source of the bug. :)

And, of course, try to reconnect again. :)

More details about this bug can be found here: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/371291

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