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Thanks for the log. Contrary to my first thoughts, the problem is most likely solvable by a setting in Diafaan SMS Server after all. The problem is that the modem is not able to log on to the mobile network fast enough after a full reboot of the modem. The GSM Modem Gateway waits 30 seconds after sending the reboot command before initializing the modem and at that time the modem is still not connected to the network.

You can either set the 'RebootBeforeInitialization' property in the advanced settings of the GSM Modem Gateway to 'False' or the 'ModemRebootTime' property to '45' or even '60' seconds. The first option disables the reboot command entirely and the second option allows the modem more time to log on to the mobile network after a reboot.

Letting the modem reboot after an error is usually the best option when the modem is used unsupervised for a long stretch of time. Disabling the reboot might be preferable when the modem is monitored regularly because it lets the modem initialize faster after it encounters an error. However, on rare occasions the modem might not be functional after an internal error occurs without rebooting it.

Regards, Henk

Hello Wayne,

If multiple modems have the same network issues then there might be a problem with the network signal strength on the location where the modems are placed. You can try the modems on a different location to see if that makes a difference. You can also try a 3G or 4G modem to check if the reception of 3G or 4G is better than GSM.

Other than relocating the modem or using a better antenna there is not much you can do to improve the network reliability for a wireless modem. You can sometimes force the modem to roam on another network that has a better network reliability but that might be blocked by the SIM card or cause surcharges. If can have a look at the communication log if you want (send it to dms@diafaan.com) but I don't think that I can give a solution that improves network reliability for this network.

Status error 65 (hexadecimal 41) is defined as 'Incompatible destination' in the specifications of SMS and that is all the explanation for the error that is available. If there is no obvious reason for this error, like a non-existing mobile number, a number from another network or a number of a phone that is roaming on another network then it is very hard to find out the exact reason for the error. Only the network operator that generated the error can determine what triggers this error.

Regards, Henk