Hey,

>
> I’ve got some problems with my gsm-connection, managed with NetworkManager 
> and ModemManager.
>
> When my connection comes up after boot, the connection works and i can ping 
> my targets via gsm.
>
> Now, when i disable the connection and reactivated it, NetworkManager says, 
> it is connected, but i’m not
>
> able to ping any of my targets, as before.
>
>
>
> So when i disable my connection with ‚nmcli con down test‘ the Connection 
> 'test' successfully deactivated
>
> When i see mmcli –m 0, the state of the modem is still connected, not 
> registered as expected.
>
> Debug log also says ‚networkmanager modem-broadband[cdc-wdm0]: failed to 
> connect modem: Failure‘
>
> I think that causes the problem, that when i try to reconnect my 
> gsm-connection it says it is
>
> activated successfully, but i’m not able the get any communication on that 
> interface (ping a target is not able).
>
>
>
> When i reboot the device and my connection is up, it works without problems.
>

Please gather MM/NM debug logs when reproducing the problem:
https://www.freedesktop.org/wiki/Software/ModemManager/Debugging/

-- 
Aleksander
https://aleksander.es
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