Sierra modem stopped working - solved

[Bernd Eggink]

On 14.06.2015 11:06, Bjørn Mork wrote:
> Bernd Eggink <monoped at sudrala.de> writes:
>> On 14.06.2015 00:22, Aleksander Morgado wrote:
>>
>>> May be a network issue? Although you said it works under other OS, so not sure.
>>
>> Certainly not a network issue. As I said, it works under Windows. I
>> also tried 3 other Linux live systems (all of which use ModemManager),
>> and it failed under each of them in the same way.
>> This is rather unsatisfying. Could it be a kernel issue? Do you know
>> of any other modem software I could try?
>
> Are you sure you are using the same settings on Windows and Linux?  I
> noticed from your log that the modem has a provisioned context which is
> different from the one you try to connect to:
>
> ModemManager[2687]: <debug> [1434208007.511793] [mm-bearer-mbim.c:529] provisioned_contexts_query_ready(): Provisioned contexts found (1):
> ModemManager[2687]: <debug> [1434208007.511856] [mm-bearer-mbim.c:535] provisioned_contexts_query_ready(): [1] context type: internet
> ModemManager[2687]: <debug> [1434208007.511887] [mm-bearer-mbim.c:536] provisioned_contexts_query_ready():              uuid: 7e5e2a7e-4e6f-7272-736b-656e7e5e2a7e
> ModemManager[2687]: <debug> [1434208007.511914] [mm-bearer-mbim.c:537] provisioned_contexts_query_ready():     access string: internet.telekom
> ModemManager[2687]: <debug> [1434208007.511940] [mm-bearer-mbim.c:538] provisioned_contexts_query_ready():          username: tmobile
> ModemManager[2687]: <debug> [1434208007.511965] [mm-bearer-mbim.c:539] provisioned_contexts_query_ready():          password:
> ModemManager[2687]: <debug> [1434208007.511996] [mm-bearer-mbim.c:540] provisioned_contexts_query_ready():       compression: none
> ModemManager[2687]: <debug> [1434208007.512030] [mm-bearer-mbim.c:541] provisioned_contexts_query_ready():              auth: pap
> ModemManager[2687]: <debug> [1434208007.512078] [mm-bearer-mbim.c:741] connect_context_step(): No specific IP family requested, defaulting to ipv4
> ModemManager[2687]: <debug> [1434208007.512104] [mm-bearer-mbim.c:772] connect_context_step(): Launching connection with APN 'internet.t-mobile'...
>
>
> I'm not saying this necessarily is wrong.  I don't know which APN is
> correct for you.  But it might explain your problems.  Please verify
> that 'ipv4' (selected by default) is correct as well.  Some operators
> have started provisioning ipv6 only contexts.

Bjørn,
you're right! With 'apn=internet.telekom,user=tmobile' everything works 
fine. No idea what might have caused the change; I'm pretty sure that 
formerly the correct APN was 'internet.t-mobile'. All other Linuxes I 
tried use this APN as well (and therefore fail).
Thanks a lot!
-- 
Bernd