Cann't open /dev/cuaU1.3

ggzengel

I have a pfsense with 2 UMTS cards over usb adapter.
Now I have seen that 1 card is down since a few weeks.
I have rebooted the pfsense to power off the UMTS card and upgraded to newest firmware.

syslog: ppp: [opt2_link0] MODEM: Fail to open serial port /dev/cuaU1.3 on speed 115200

Normally I can use cu to open the interface in the gap while ppp tries to connect.
After this didn't work I disabled the interface and while this didn't work I rebooted pfsense with disabled interface.
After reboot there is no mpd for this device.
But it always says: all ports busy.

cu -l /dev/cuaU1.4 works:

cu -l /dev/cuaU1.4
Connected
ATI
Sierra Wireless, Incorporated
MC8790
APP1

OK

Why can't I open /dev/cuaU1.3?

jimp

Why not select /dev/cuaU1.4 for the modem rather than 1.3?

Modems often offer multiple sub-devices but not all of them actually work for serial, and some change depending on the mode the card is in from what I've heard.

So if you re-select the port as 1.4 from Interfaces > (assign), PPPs tab, it may work OK.

ggzengel

No, APP1 is not for data.
Only 1.3 has the right service.

jimp

Something is preventing the port from being opened, then. Either it isn't accessible for one reason or another, or some other process already has a hold on it.

Does the node actually exist in /dev/? Can you hit it with cu or tip and get a proper AT command response? (you can kill the mpd process trying to latch onto it, if that helps)