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smores
n00b
n00b


Joined: 02 Aug 2015
Posts: 1

PostPosted: Sun Aug 02, 2015 9:37 am    Post subject: mobile broadband requires NetworkManager restart to work Reply with quote

Hello,

I'm summarizing the most important information (according to my judgement) first before going into detail.

Problem:
My USB mobile broadmand dongle can not connect to the network unless NetworkManager is restarted (i.e. NetworkManager start with the dongle already plugged in). I'd like to use the USB dongle w/o restarting NetworkManager.

Steps to reproduce:

  1. make sure USB mobile broadband dongle is unplugged
  2. make sure NetworkManager is started
  3. plug in USB mobile broadband dongle (and wait until it is noticed by NetworkManager)
  4. try to connect to preconfigured mobile broadband network with NetworkManager (via nm-applet) => connection fails
  5. restart NetworkManager (/etc/init.d/NetworkManager restart; the USB dongle stays plugged in)
  6. try to connect to preconfigured mobile broadband network with NetworkManager (via nm-applet) => success (can browse web, etc.)


most visible error messages:

  • ModemManager[2800]: <warn> (ttyUSB0): port attributes not fully set
  • (1) Creating object for path '/org/freedesktop/NetworkManager/ActiveConnection/1' failed in libnm-glib.
  • Failed to connect 'O2 Pay-by-MB': Connection requested IPv4 but IPv4 is unsuported by the modem.


Additional Details:

  • I use fluxbox, so I may miss an important service/daemon that is responsible for correct information passing between NetworkManager and other services despite my best efforts.
  • When fluxbox starts, it runs dbus-launch nm-applet &
  • The USB mobile broadband modem in question is a Huawei E173
  • The preconfigured mobile broadband connection is called O2 Pay-by-MB and successfully connects if NetworkManager is started with the USB dongle plugged in
  • When failing to connect to the mobile broadband network, iIn addition to the log messages a window pops up that reads (1) Creating object for path '/org/freedesktop/NetworkManager/ActiveConnection/1' failed in libnm-glib.
  • I also have, among other processes, the following processes running (while being connected via mobile broadband)
    Code:

    ps -A
      PID TTY          TIME CMD
      ...
      606 ?        00:00:00 cfg80211
     1246 ?        00:00:00 ipv6_addrconf
     1554 ?        00:00:00 systemd-udevd
     1603 ?        00:00:01 irq/46-iwlwifi
     2767 ?        00:00:00 dbus-daemon
     2795 ?        00:00:00 wpa_supplicant
     2797 ?        00:00:00 polkitd
     2800 ?        00:00:06 ModemManager
     2831 ?        00:00:13 acpid
     2853 ?        00:00:00 console-kit-dae
     3774 ?        00:00:00 slim
     4064 ?        00:00:04 fluxbox
     4088 ?        00:00:00 dbus-launch
     4089 ?        00:00:00 dbus-daemon
     4108 ?        00:00:02 nm-applet
     4115 ?        00:00:00 dbus-daemon
     4152 ?        00:00:00 dbus-daemon
     5164 ?        00:00:00 gnome-keyring-d
     6585 ?        00:00:01 NetworkManager
     6623 ?        00:00:00 pppd
     7405 ?        00:00:00 notification-da
      ...



Log messages:
Following the above mentioned steps to reproduce my problem, the following logs will appear (incrementally) in /var/log/message:

  1. make sure USB mobile broadband dongle is unplugged
  2. make sure NetworkManager is started
  3. plug in USB mobile broadband dongle (and wait until it is noticed by NetworkManager)
    Code:

    Aug  2 08:10:59 cow kernel: usb 1-2: new high-speed USB device number 8 using xhci_hcd
    Aug  2 08:10:59 cow kernel: usb 1-2: New USB device found, idVendor=12d1, idProduct=1446
    Aug  2 08:10:59 cow kernel: usb 1-2: New USB device strings: Mfr=3, Product=2, SerialNumber=0
    Aug  2 08:10:59 cow kernel: usb 1-2: Product: HUAWEI Mobile
    Aug  2 08:10:59 cow kernel: usb 1-2: Manufacturer: HUAWEI Technology
    Aug  2 08:10:59 cow kernel: usb-storage 1-2:1.0: USB Mass Storage device detected
    Aug  2 08:10:59 cow kernel: scsi host13: usb-storage 1-2:1.0
    Aug  2 08:10:59 cow kernel: usb-storage 1-2:1.1: USB Mass Storage device detected
    Aug  2 08:10:59 cow kernel: scsi host14: usb-storage 1-2:1.1
    Aug  2 08:10:58 cow laptop-mode[5956]: Laptop mode
    Aug  2 08:10:58 cow laptop-mode[5957]: enabled, not active
    Aug  2 08:10:58 cow laptop-mode[5989]: Laptop mode
    Aug  2 08:10:58 cow laptop-mode[5990]: enabled, not active
    Aug  2 08:10:58 cow usb_modeswitch[6010]: switch device 12d1:1446 on 001/008
    Aug  2 08:11:00 cow kernel: usb 1-2: USB disconnect, device number 8
    Aug  2 08:10:58 cow laptop-mode[6107]: Laptop mode
    Aug  2 08:10:58 cow laptop-mode[6108]: enabled, not active
    Aug  2 08:10:58 cow laptop-mode[6140]: Laptop mode
    Aug  2 08:10:58 cow laptop-mode[6141]: enabled, not active
    Aug  2 08:11:04 cow kernel: usb 1-2: new high-speed USB device number 9 using xhci_hcd
    Aug  2 08:11:04 cow kernel: usb 1-2: New USB device found, idVendor=12d1, idProduct=1436
    Aug  2 08:11:04 cow kernel: usb 1-2: New USB device strings: Mfr=4, Product=3, SerialNumber=0
    Aug  2 08:11:04 cow kernel: usb 1-2: Product: HUAWEI Mobile
    Aug  2 08:11:04 cow kernel: usb 1-2: Manufacturer: HUAWEI Technology
    Aug  2 08:11:04 cow kernel: usb-storage 1-2:1.0: USB Mass Storage device detected
    Aug  2 08:11:04 cow kernel: option 1-2:1.0: GSM modem (1-port) converter detected
    Aug  2 08:11:04 cow kernel: usb 1-2: GSM modem (1-port) converter now attached to ttyUSB0
    Aug  2 08:11:04 cow kernel: usb-storage 1-2:1.1: USB Mass Storage device detected
    Aug  2 08:11:04 cow kernel: usb-storage 1-2:1.2: USB Mass Storage device detected
    Aug  2 08:11:04 cow kernel: usb-storage 1-2:1.3: USB Mass Storage device detected
    Aug  2 08:11:04 cow kernel: option 1-2:1.3: GSM modem (1-port) converter detected
    Aug  2 08:11:04 cow kernel: usb 1-2: GSM modem (1-port) converter now attached to ttyUSB1
    Aug  2 08:11:04 cow kernel: usb-storage 1-2:1.4: USB Mass Storage device detected
    Aug  2 08:11:04 cow kernel: option 1-2:1.4: GSM modem (1-port) converter detected
    Aug  2 08:11:04 cow kernel: usb 1-2: GSM modem (1-port) converter now attached to ttyUSB2
    Aug  2 08:11:04 cow kernel: usb-storage 1-2:1.5: USB Mass Storage device detected
    Aug  2 08:11:04 cow kernel: scsi host20: usb-storage 1-2:1.5
    Aug  2 08:11:04 cow kernel: usb-storage 1-2:1.6: USB Mass Storage device detected
    Aug  2 08:11:04 cow kernel: scsi host21: usb-storage 1-2:1.6
    Aug  2 08:11:02 cow ModemManager[2800]: <warn>  (ttyUSB1): port attributes not fully set
    Aug  2 08:11:03 cow ModemManager[2800]: <warn>  (ttyUSB2): port attributes not fully set
    Aug  2 08:11:03 cow laptop-mode[6377]: Laptop mode
    Aug  2 08:11:03 cow laptop-mode[6378]: enabled, not active
    Aug  2 08:11:03 cow laptop-mode[6410]: Laptop mode
    Aug  2 08:11:03 cow laptop-mode[6411]: enabled, not active
    Aug  2 08:11:03 cow logger[6429]: usb_modeswitch: switched to 12d1:1436 on 001/009
    Aug  2 08:11:04 cow ModemManager[2800]: <warn>  (ttyUSB0): port attributes not fully set
    Aug  2 08:11:04 cow laptop-mode[6474]: Laptop mode
    Aug  2 08:11:04 cow laptop-mode[6475]: enabled, not active
    Aug  2 08:11:06 cow ModemManager[2800]: <warn>  (ttyUSB1): port attributes not fully set
    Aug  2 08:11:06 cow ModemManager[2800]: <warn>  (ttyUSB2): port attributes not fully set
    Aug  2 08:11:10 cow kernel: scsi 20:0:0:0: CD-ROM            HUAWEI   Mass Storage     2.31 PQ: 0 ANSI: 2
    Aug  2 08:11:10 cow kernel: scsi 21:0:0:0: Direct-Access     HUAWEI   SD Storage       2.31 PQ: 0 ANSI: 2
    Aug  2 08:11:10 cow kernel: sd 21:0:0:0: Attached scsi generic sg1 type 0
    Aug  2 08:11:10 cow kernel: sr 20:0:0:0: [sr0] scsi-1 drive
    Aug  2 08:11:10 cow kernel: sr 20:0:0:0: Attached scsi CD-ROM sr0
    Aug  2 08:11:10 cow kernel: sr 20:0:0:0: Attached scsi generic sg2 type 5
    Aug  2 08:11:10 cow kernel: sd 21:0:0:0: [sdb] Attached SCSI removable disk
    Aug  2 08:11:15 cow ModemManager[2800]: <info>  Creating modem with plugin 'Huawei' and '3' ports
    Aug  2 08:11:15 cow ModemManager[2800]: <warn>  (ttyUSB2): port attributes not fully set
    Aug  2 08:11:15 cow ModemManager[2800]: <info>  Modem for device at '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-2' successfully created
    Aug  2 08:11:16 cow ModemManager[2800]: Error while checking ^SYSCFGEX format: Unknown error
    Aug  2 08:11:16 cow ModemManager[2800]: <warn>  couldn't load Supported IP families: 'SIM PIN required'
    Aug  2 08:11:16 cow ModemManager[2800]: <info>  Modem: state changed (unknown -> locked)
    Aug  2 08:11:16 cow ModemManager[2800]: <warn>  couldn't load IMSI: 'SIM PIN required'
    Aug  2 08:11:16 cow ModemManager[2800]: <warn>  couldn't load Operator identifier: 'Cannot load Operator ID without IMSI'
    Aug  2 08:11:16 cow ModemManager[2800]: <warn>  couldn't load list of Own Numbers: 'Failed to parse NV MDN command result: -17'
    Aug  2 08:11:16 cow NetworkManager[5227]: <warn>  (ttyUSB2): cannot enable/disable modem: locked
    Aug  2 08:11:16 cow NetworkManager[5227]: <info>  (ttyUSB2): new Broadband device (driver: 'option1' ifindex: 0)
    Aug  2 08:11:16 cow NetworkManager[5227]: <info>  (ttyUSB2): exported as /org/freedesktop/NetworkManager/Devices/6
    Aug  2 08:11:16 cow NetworkManager[5227]: <info>  (ttyUSB2): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
    Aug  2 08:11:16 cow NetworkManager[5227]: <info>  (ttyUSB2): preparing device
    Aug  2 08:11:16 cow NetworkManager[5227]: <info>  (ttyUSB2): modem state 'locked'
    Aug  2 08:11:16 cow NetworkManager[5227]: <info>  (ttyUSB2): device state change: unavailable -> disconnected (reason 'none') [20 30 0]
    Aug  2 08:11:16 cow ModemManager[2800]: <warn>  (ttyUSB2): port attributes not fully set
    Aug  2 08:11:16 cow ModemManager[2800]: <warn>  (ttyUSB2): port attributes not fully set
    Aug  2 08:11:19 cow ModemManager[2800]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (locked -> initializing)
    Aug  2 08:11:19 cow ModemManager[2800]: <warn>  (ttyUSB2): port attributes not fully set
    Aug  2 08:11:20 cow ModemManager[2800]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (initializing -> disabled)
    Aug  2 08:11:20 cow NetworkManager[5227]: <info>  (ttyUSB2): modem state changed, 'locked' --> 'disabled' (reason: unknown)
    Aug  2 08:11:20 cow NetworkManager[5227]: <info>  (ttyUSB2): modem state changed, 'disabled' --> 'enabling' (reason: user preference)
    Aug  2 08:11:20 cow ModemManager[2800]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (disabled -> enabling)
    Aug  2 08:11:20 cow ModemManager[2800]: <warn>  (ttyUSB2): port attributes not fully set
    Aug  2 08:11:21 cow ModemManager[2800]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: 3GPP Registration state changed (unknown -> registering)
    Aug  2 08:11:21 cow ModemManager[2800]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: 3GPP Registration state changed (registering -> home)
    Aug  2 08:11:21 cow ModemManager[2800]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (enabling -> registered)
    Aug  2 08:11:21 cow NetworkManager[5227]: <info>  (ttyUSB2): modem state changed, 'enabling' --> 'registered' (reason: user-requested)

  4. try to connect to preconfigured mobile broadband network with NetworkManager (via nm-applet) => connection fails
    Code:

    Aug  2 08:12:55 cow NetworkManager[5227]: <info>  (ttyUSB2): Activation: starting connection 'O2 Pay-by-MB'
    Aug  2 08:12:55 cow NetworkManager[5227]: <info>  (ttyUSB2): Activation: Stage 1 of 5 (Device Prepare) scheduled...
    Aug  2 08:12:55 cow NetworkManager[5227]: <info>  (ttyUSB2): Activation: Stage 1 of 5 (Device Prepare) started...
    Aug  2 08:12:55 cow NetworkManager[5227]: <info>  (ttyUSB2): device state change: disconnected -> prepare (reason 'none') [30 40 0]
    Aug  2 08:12:55 cow NetworkManager[5227]: <info>  NetworkManager state is now CONNECTING
    Aug  2 08:12:55 cow NetworkManager[5227]: <warn>  (ttyUSB2): Failed to connect 'O2 Pay-by-MB': Connection requested IPv4 but IPv4 is unsuported by the modem.
    Aug  2 08:12:55 cow NetworkManager[5227]: <info>  (ttyUSB2): device state change: prepare -> failed (reason 'modem-init-failed') [40 120 28]
    Aug  2 08:12:55 cow NetworkManager[5227]: <info>  NetworkManager state is now DISCONNECTED
    Aug  2 08:12:55 cow NetworkManager[5227]: <warn>  (ttyUSB2): Activation: failed for connection 'O2 Pay-by-MB'
    Aug  2 08:12:55 cow NetworkManager[5227]: <info>  (ttyUSB2): Activation: Stage 1 of 5 (Device Prepare) complete.
    Aug  2 08:12:55 cow NetworkManager[5227]: <info>  (ttyUSB2): device state change: failed -> disconnected (reason 'none') [120 30 0]
    Aug  2 08:12:55 cow NetworkManager[5227]: <info>  (ttyUSB2): deactivating device (reason 'none') [0]

  5. restart NetworkManager (/etc/init.d/NetworkManager restart; the USB dongle stays plugged in)
    Code:

    Aug  2 08:13:35 cow NetworkManager[5227]: <info>  caught signal 15, shutting down normally.
    Aug  2 08:13:35 cow NetworkManager[5227]: <info>  (enp3s0): device state change: unavailable -> unmanaged (reason 'unmanaged') [20 10 3]
    Aug  2 08:13:37 cow kernel: IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready
    Aug  2 08:13:36 cow NetworkManager[5227]: <info>  (wlp4s0): device state change: disconnected -> unmanaged (reason 'unmanaged') [30 10 3]
    Aug  2 08:13:37 cow kernel: IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready
    Aug  2 08:13:36 cow NetworkManager[5227]: <info>  (ttyUSB2): device state change: disconnected -> unmanaged (reason 'unmanaged') [30 10 3]
    Aug  2 08:13:36 cow NetworkManager[5227]: <info>  exiting (success)
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  NetworkManager (version 1.0.2) is starting...
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  Read config: /etc/NetworkManager/NetworkManager.conf
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  WEXT support is disabled
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  VPN: loaded org.freedesktop.NetworkManager.vpnc
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  VPN: loaded org.freedesktop.NetworkManager.openvpn
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  VPN: loaded org.freedesktop.NetworkManager.openconnect
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  Loaded plugin keyfile: (c) 2007 - 2015 Red Hat, Inc.  To report bugs please use the NetworkManager mailing list.
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  keyfile: new connection /etc/NetworkManager/system-connections/bom (########-####-####-####-############,"bom")
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  keyfile: new connection /etc/NetworkManager/system-connections/bar (########-####-####-####-############,"bar")
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  keyfile: new connection /etc/NetworkManager/system-connections/O2 Pay-by-MB (61f8c610-c549-45e6-82e6-044c6f77e35d,"O2 Pay-by-MB")
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  keyfile: new connection /etc/NetworkManager/system-connections/baz (########-####-####-####-############,"baz")
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  keyfile: new connection /etc/NetworkManager/system-connections/bat (########-####-####-####-############,"bat")
    Aug  2 08:13:36 cow NetworkManager[6585]: <warn>  keyfile: error loading connection from file /etc/NetworkManager/system-connections/.keep_net-misc_networkmanager-0: invalid connection: connection.type: property is missing
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  keyfile: new connection /etc/NetworkManager/system-connections/bar (########-####-####-####-############,"bar")
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  keyfile: new connection /etc/NetworkManager/system-connections/foo (########-####-####-####-############,"foo")
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  monitoring kernel firmware directory '/lib/firmware'.
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  rfkill1: found WiFi radio killswitch (at /sys/devices/pci0000:00/0000:00:1c.2/0000:04:00.0/ieee80211/phy0/rfkill1) (driver iwlwifi)
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  WiFi hardware radio set enabled
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  WWAN hardware radio set enabled
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  Loaded device plugin: /usr/lib64/NetworkManager/libnm-device-plugin-bluetooth.so
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  Loaded device plugin: /usr/lib64/NetworkManager/libnm-device-plugin-wifi.so
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  Loaded device plugin: /usr/lib64/NetworkManager/libnm-device-plugin-adsl.so
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  Loaded device plugin: /usr/lib64/NetworkManager/libnm-device-plugin-wwan.so
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  WiFi enabled by radio killswitch; enabled by state file
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  WWAN enabled by radio killswitch; enabled by state file
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  WiMAX enabled by radio killswitch; enabled by state file
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  Networking is enabled by state file
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (lo): link connected
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (lo): carrier is ON
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (lo): new Generic device (driver: 'unknown' ifindex: 1)
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (lo): exported as /org/freedesktop/NetworkManager/Devices/0
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (enp3s0): carrier is OFF
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (enp3s0): new Ethernet device (driver: 'r8169' ifindex: 2)
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (enp3s0): exported as /org/freedesktop/NetworkManager/Devices/1
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (enp3s0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (enp3s0): preparing device
    Aug  2 08:13:37 cow kernel: r8169 0000:03:00.0 enp3s0: link down
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (sit0): new Generic device (driver: 'sit' ifindex: 3)
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (sit0): exported as /org/freedesktop/NetworkManager/Devices/2
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0): using nl80211 for WiFi device control
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0): driver supports Access Point (AP) mode
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0): new 802.11 WiFi device (driver: 'iwlwifi' ifindex: 4)
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0): exported as /org/freedesktop/NetworkManager/Devices/3
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
    Aug  2 08:13:38 cow kernel: iwlwifi 0000:04:00.0: L1 Enabled - LTR Enabled
    Aug  2 08:13:38 cow kernel: iwlwifi 0000:04:00.0: L1 Enabled - LTR Enabled
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0): preparing device
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0) supports 5 scan SSIDs
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0): supplicant interface state: starting -> ready
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0): device state change: unavailable -> disconnected (reason 'supplicant-available') [20 30 42]
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  ModemManager available in the bus
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (ttyUSB2): new Broadband device (driver: 'option1' ifindex: 0)
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (ttyUSB2): exported as /org/freedesktop/NetworkManager/Devices/4
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (ttyUSB2): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (ttyUSB2): preparing device
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (ttyUSB2): modem state 'registered'
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0): supplicant interface state: ready -> disconnected
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (wlp4s0) supports 5 scan SSIDs
    Aug  2 08:13:36 cow NetworkManager[6585]: <info>  (ttyUSB2): device state change: unavailable -> disconnected (reason 'none') [20 30 0]
    Aug  2 08:13:37 cow /etc/init.d/NetworkManager[6547]: WARNING: NetworkManager has started, but is inactive
    Aug  2 08:13:39 cow NetworkManager[6585]: <info>  (wlp4s0): supplicant interface state: disconnected -> inactive
    Aug  2 08:13:41 cow NetworkManager[6585]: <info>  startup complete

  6. try to connect to preconfigured mobile broadband network with NetworkManager (via nm-applet) => success (can browse web, etc.)
    Code:

    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: starting connection 'O2 Pay-by-MB'
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 1 of 5 (Device Prepare) scheduled...
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 1 of 5 (Device Prepare) started...
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): device state change: disconnected -> prepare (reason 'none') [30 40 0]
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  NetworkManager state is now CONNECTING
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 1 of 5 (Device Prepare) complete.
    Aug  2 08:13:58 cow ModemManager[2800]: <info>  Simple connect started...
    Aug  2 08:13:58 cow ModemManager[2800]: <info>  Simple connect state (4/8): Wait to get fully enabled
    Aug  2 08:13:58 cow ModemManager[2800]: <info>  Simple connect state (5/8): Register
    Aug  2 08:13:58 cow ModemManager[2800]: <info>  Simple connect state (6/8): Bearer
    Aug  2 08:13:58 cow ModemManager[2800]: <info>  Simple connect state (7/8): Connect
    Aug  2 08:13:58 cow ModemManager[2800]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (registered -> connecting)
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): modem state changed, 'registered' --> 'connecting' (reason: user-requested)
    Aug  2 08:13:58 cow ModemManager[2800]: <warn>  (ttyUSB0): port attributes not fully set
    Aug  2 08:13:58 cow ModemManager[2800]: <info>  Modem /org/freedesktop/ModemManager1/Modem/1: state changed (connecting -> connected)
    Aug  2 08:13:58 cow ModemManager[2800]: <info>  Simple connect state (8/8): All done
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): modem state changed, 'connecting' --> 'connected' (reason: user-requested)
    Aug  2 08:13:58 cow NetworkManager[6585]: <warn>  (ttyUSB2): failed to look up interface index
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 2 of 5 (Device Configure) scheduled...
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 2 of 5 (Device Configure) starting...
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): device state change: prepare -> config (reason 'none') [40 50 0]
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 2 of 5 (Device Configure) successful.
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 2 of 5 (Device Configure) complete.
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 3 of 5 (IP Configure Start) scheduled.
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 3 of 5 (IP Configure Start) started...
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): device state change: config -> ip-config (reason 'none') [50 70 0]
    Aug  2 08:13:58 cow NetworkManager[6585]: <warn>  (ttyUSB2): interface ttyUSB0 not up for IP configuration
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): using modem-specified IP timeout: 20 seconds
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  starting PPP connection
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  pppd started with pid 6623
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 3 of 5 (IP Configure Start) complete.
    Aug  2 08:13:58 cow pppd[6623]: Plugin /usr/lib64/pppd/2.4.7/nm-pppd-plugin.so loaded.
    Aug  2 08:13:58 cow pppd[6623]: pppd 2.4.7 started by larry, uid 0
    Aug  2 08:13:58 cow pppd[6623]: Using interface ppp0
    Aug  2 08:13:58 cow pppd[6623]: Connect: ppp0 <--> /dev/ttyUSB0
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ppp0): new Generic device (driver: 'unknown' ifindex: 6)
    Aug  2 08:13:58 cow NetworkManager[6585]: <info>  (ppp0): exported as /org/freedesktop/NetworkManager/Devices/5
    Aug  2 08:13:58 cow pppd[6623]: CHAP authentication succeeded
    Aug  2 08:13:58 cow pppd[6623]: CHAP authentication succeeded
    Aug  2 08:14:01 cow pppd[6623]: Could not determine remote IP address: defaulting to 10.##.##.##
    Aug  2 08:14:01 cow pppd[6623]: local  IP address 10.##.##.##
    Aug  2 08:14:01 cow pppd[6623]: remote IP address 10.##.##.##
    Aug  2 08:14:01 cow pppd[6623]: primary   DNS address ###.###.###.###
    Aug  2 08:14:01 cow pppd[6623]: secondary DNS address ###.###.###.###
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  PPP manager (IPv4 Config Get) reply received.
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 5 of 5 (IPv4 Configure Commit) scheduled...
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 5 of 5 (IPv4 Commit) started...
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  (ttyUSB2): device state change: ip-config -> ip-check (reason 'none') [70 80 0]
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: Stage 5 of 5 (IPv4 Commit) complete.
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  (ttyUSB2): device state change: ip-check -> secondaries (reason 'none') [80 90 0]
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  (ttyUSB2): device state change: secondaries -> activated (reason 'none') [90 100 0]
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  NetworkManager state is now CONNECTED_LOCAL
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  NetworkManager state is now CONNECTED_GLOBAL
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  Policy set 'O2 Pay-by-MB' (ppp0) as default for IPv4 routing and DNS.
    Aug  2 08:14:01 cow NetworkManager[6585]: <info>  (ttyUSB2): Activation: successful, device activated.
    Aug  2 08:14:01 cow dbus[2767]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
    Aug  2 08:14:01 cow dbus[2767]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
    Aug  2 08:14:01 cow nm-dispatcher[6644]: Dispatching action 'up' for ppp0
    Aug  2 08:14:01 cow /etc/init.d/NetworkManager[6657]: status: inactive
    Aug  2 08:14:01 cow /etc/init.d/NetworkManager[6669]: status: inactive



Conclusion/Question:
I researched the error messages and always ended up with inconclusive results.
I have not been able to determine the root of the problem and would be grateful for any help in doing so in order to finally solve my problem.

Thank you very much for your advice in advance.
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