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NetworkManager deleted WWAN System Connection?

in flag

I've created a custom File and put it in etc/NetworkManager/system-connection/ for using LTE in a IoT-Device.

[connection] id=cel-1 type=gsm interface-name=cdc-wdm0 permissions=

[gsm] apn=internet.telekom number=*99# username=t-mobile password=tm

[ipv4] dns-search= ipv4.dns=1.1.1.1,1.0.0.1,8.8.8.8,8.8.4.4 method=auto route-metric=400

[ipv6] addr-gen-mode=stable-privacy dns-search= method=auto

Everything worked fine, the connection to the modem (installed modemmanager for this) was up and worked. After 5 months suddenly the connection interrupted at 3.00 a.m. I plugged in the device via LAN an and I recognized, that the cel-1 file with the apn settings were overwritten...

apn=internet

how can that happen?

I've tried to finde something out via journalctl, but that was no much helpful.

GDollack avatar
in flag
Ok I'am asking, why (I think it was the Networkmanager) the NetworkManager has automatically change the file with the APN settings.
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