<div dir="ltr"><div dir="ltr">I am experiencing intermittent issues with session disconnects on a private APN on the AT&T network. When experiencing the issue we see "bearer call end reason (1): 'generic-unspecified'" in the ModemManager logs. I'm running Modem Manager version 1.8.0 with custom control scripts, we aren't presently using Network Manager. The modem is a Sierra Wireless MC7354 running SWI9X15C_05.05.58.00 r27038 carmd-fwbuild1 2015/03/04 21:30:23. Rebooting the modem (cold boot) and restarting the embedded system driving it (including a modem reboot) do not affect the behaviour. This specific site observed the problem for three days last week, it then worked properly for two days and resumed the disconnection after 72 hours of clean behaviour. There are three other devices located at this same site. Two of them have shown no issues in the past two weeks, one followed a similar pattern to this one for the first period of session disconnects but did not resume with the other unit. AT&T indicates that the modem itself is disconnecting from the network and that the disconnect is not tower or network initiated. I have received control plane packet captures that I intend to compare with these logs to confirm the behaviour details this weekend, but wanted to see if anyone on the list could offer any guidance. I would like to run in debug mode but I can't restart the ModemManager process remotely without an unacceptable risk of connection loss. If there's a way to enable debug mode on the running Modem Manager process I could get much more detailed info from the site. Thanks very much for your help, I'm ready to provide any information required, logs follow, -JohnF Feb 22 15:20:18 device ModemManager[932]: <info> bearer call end reason (1): 'generic-unspecified' Feb 22 15:20:18 device ModemManager[932]: <info> bearer verbose call end reason (3,1028): [cm] (null) Feb 22 15:20:18 device ModemManager[932]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connected -> registered) Feb 22 15:20:19 device ModemManager[932]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting) Feb 22 15:20:20 device ModemManager[932]: <info> QMI IPv4 Settings: Feb 22 15:20:20 device ModemManager[932]: <info> Address: 10.x.x.225/30 Feb 22 15:20:20 device ModemManager[932]: <info> Gateway: 10.x.x.226 Feb 22 15:20:20 device ModemManager[932]: <info> DNS #1: 8.8.8.8 Feb 22 15:20:20 device ModemManager[932]: <info> DNS #2: 8.8.4.4 Feb 22 15:20:20 device ModemManager[932]: <info> MTU: 1430 Feb 22 15:20:20 device ModemManager[932]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> connected) Feb 22 15:35:58 device ModemManager[932]: <info> bearer call end reason (1): 'generic-unspecified' Feb 22 15:35:58 device ModemManager[932]: <info> bearer verbose call end reason (3,1028): [cm] (null) Feb 22 15:35:58 device ModemManager[932]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connected -> registered) Feb 22 15:35:59 device ModemManager[932]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting) Feb 22 15:35:59 device ModemManager[932]: <info> QMI IPv4 Settings: Feb 22 15:35:59 device ModemManager[932]: <info> Address: 10.x.x.35/29 Feb 22 15:35:59 device ModemManager[932]: <info> Gateway: 10.x.x.36 Feb 22 15:35:59 device ModemManager[932]: <info> DNS #1: 8.8.8.8 Feb 22 15:35:59 device ModemManager[932]: <info> DNS #2: 8.8.4.4 Feb 22 15:35:59 device ModemManager[932]: <info> MTU: 1430 Feb 22 15:35:59 device ModemManager[932]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> connected) Feb 22 15:51:08 device ModemManager[932]: <info> bearer call end reason (1): 'generic-unspecified' Feb 22 15:51:08 device ModemManager[932]: <info> bearer verbose call end reason (3,1028): [cm] (null) Feb 22 15:51:08 device ModemManager[932]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connected -> registered) Feb 22 15:51:09 device ModemManager[932]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting) Feb 22 15:51:09 device ModemManager[932]: <info> QMI IPv4 Settings: Feb 22 15:51:09 device ModemManager[932]: <info> Address: 10.x.x.85/30 Feb 22 15:51:09 device ModemManager[932]: <info> Gateway: 10.x.x.86 Feb 22 15:51:09 device ModemManager[932]: <info> DNS #1: 8.8.8.8 Feb 22 15:51:09 device ModemManager[932]: <info> DNS #2: 8.8.4.4 Feb 22 15:51:09 device ModemManager[932]: <info> MTU: 1430 Feb 22 15:51:09 device ModemManager[932]: <info> Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> connected) </div></div>