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[ubuntu] Broadband USB MODEM : Unable to establish Connection

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http://ubuntuforums.org – I have a ZTE-AC2726 Broadband USB MODEM and I am having a problem connecting. It used to work perfectly well with Previous versions of Ubuntu but not with 12.04, which I am currently using. I need help is establishing connection and I don't know where to start looking. Network-Manager, Modemmanager and usb_modeswitch are all in place. Network manager detects my said device as modem... so I really don't know nor have any idea where to look. I suspected that It could be ufw and tried to connect disabling ufw... it didn't help though. Any pointers to help me troubleshoot this issue are most (Hardware)

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Submitted by colm on 08/24/2012

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Hi all,

Just thought I would post up my experience/problems/fix as a few people seem to have been having the same problems.

Using Ubuntu 9.10 on laptop.

Heres what I have: Dell E6420 XFR notebook with the Dell DW5800 4G/LTE with GPS modem. The Modem is AKA Novatel E362 or Gobi 4000 I think.

I've spent 3 days trying to get the modem to work and I have finaly got it working, I am posting this over the Verizon broadband modem and I did a speed test and got 7mbps inbound and 1.6mbps out.

I'm using the native Modem manager in Ubuntu 12.04 Lts d

I have Ubuntu 12.04 and a 4G mobile broadband-modem called, ZTE mf880 ltf usb modem. Every time I loose internet-connection, Ubuntu seem to "loose track" of the modem and I have to pull it out and put it back in again, only to wait for Ubuntu to detect it again.

PROBLEM:

1 - The netbook can sometimes, sometimes not, connect to the internet mobile broadband 3G (or 2G GSM) via USB 3G modem.

2 - For it to connect to mobile broadband (when it can) I have, after sticking the modem into the USB port, and then enter the shell prompt with the command:

/ Sys/bus/usb-serial/drivers/option1/new_id

3 - Then I have to restart the network-manager:

Service networ

I am using wicd network manager to connect to my wireless network, it was working fine until I got a new modem/router from my isp, the original one was a livebox but this is a Thomson tg172 modem.

I've been trying to install my broadband modem on Fedora 17, using the included files on the device itself first, then using usb_modeswitch ...etc.

...but it never works, unless I do one thing, which is start my computer on Windows, then fire-up the stick modem, make sure it's working, then restart to Fedora 17.

Otherwise, it doesn't work at all.

Huwaei modem not working 26 weeks 3 days ago

Yesterday I installed 12.10 in my Sony Vaio laptop. I have Huwaei E173 3G modem, I simply inserted that modem into USB slot, after a few seconds modem started blinking and activated. I opened network profile and created a new network under 'Mobile broadband' tab everything was automated and I felt awesome, infact I used net for a while.

Modem Manager GUI 35 weeks 2 days ago

Modem Manager GUI is frontend for ModemManager daemon able to control specific modem functions. (...)Read the rest of Modem Manager GUI (64 words)

© ruchi for Ubuntu Geek, 2012.

It's a long post but nearly covers all my experiments and changes I did to my NM. Hope the information is complete and if there are still question, more information can be provided.

I've a ZTE AC2726 USB Modem (CDMA modem) which worked fine in Ubuntu 10.04 /11.10. I recently switched to 12.04.1 (precise pangolin).