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Huawei E173 problems
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September 16, 2015
10:19 pm

Hi and thanks for the quick reply.

I added the command as you described and it seems to work much better. It has not stopped working for several of hours now, so it looks like this did the trick. As you mentioned about USB modems, I will proberly go for a network modem instead it feels like they are more relaible.

Thanks, Joakim

September 16, 2015
9:47 am
Henk Helmantel
Forum Posts: 1502
Member Since:
May 28, 2013
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Hello Joakim,

'Dongle' style USB GSM modems sometimes are a bit hit or miss. A modem that might work well on one computer or version of Windows might not work reliably on another computer or even on the same computer with another version of Windows. Compatibility with the mobile network might also be an issue, sometimes a GSM modem works flawlessly on one network and not very well on another network.

Sometimes it helps to update the firmware and USB driver for the modem but there is very little you can do in Diafaan SMS Server when the modem behaves unreliably. The only thing you can try is to set the 'RebootBeforeInitialization' property in the advanced options of the GSM Modem Gateway to 'True'. When this option is active, Diafaan SMS Server will send a full reboot command to the modem when a problem occurs.

Unfortunately, the reboot option does not always work properly for USB modems and it might cause more problems than it solves. That is the reason that this option is only enabled by default for serial port and LAN modems and disabled for USB modems.

Regards, Henk

September 15, 2015
9:08 pm


I am trying out your software, that I am planing to go live with and also a "try" of your support.


I am having a E173 modem and it works for a short time and then it stops to send and receive SMS. I noticed that it open and close the COM port and I am not sure if this is the problem. I read somewhere else that I should try another port, so I did and the behaviour is stil there.

The software is installed on a new Windows 7 installation.

Firmware on the modem is: 11.126..85.00.209

Driver version in windows is:

Any suggestion on what to do?

Best regards, Joakim

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