no WiFi sync only 4G works

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Hello,

I bought the DAVx5 long time ago (for Android) and it always worked with my Nextcloud on Pi.
I was very happy w/ this nice little tool.

But since some few weeks I cannot sync any more. My pad w/ WiFi only can not at all and my phone (Nokia 8 w/ Android 9) only when I disable WiFi connection (-> over mobile connection 4G).

I deleted account in DAVx and configured new, but it cannot find services. Also I playes w/ WiFi only sync option in DAVx but it does not help.

Any ideas?
PS: Outlook w/ CalDav plugin works as well.

Hello,

Sounds like a connectivity/internal network problem of your WiFi. Can you please post

1. an explanation what “cannot sync anymore” means – is there an error message, does it fail silently? etc.
2. whether it works when you force synchronization while you’re on WiFi
3. debug info
4. verbose logs when you force synchronization
5. details of the account creation error?

Thanks!

deleted.
Proxy was enabled.

You have activated a proxy setting in the davx5 app settings. Please deactivate it and try again. Does that help?

correct, sorry I was playing w/ different settings.
Now proxy is off.

Well it is not a device issue, I see this on 1 tablet and on 2 phones.

I attache some files.
davx5-log.txt

Maybe your router or firewall changes the caldav or carddav requests from DAVx5 so that the server can’t process it anymore… Thats the only thing I could imagine.

Your server sent a 400 Bad Request response, but the request looks fine. Please have a look at your server logs, maybe you can find the reason there. Which server/version are you using?

Thanks @devvv4ever for your hint - it did it !

I really had to add a exception in the router (AVM Fritzbox), as descripted below:
https://en.avm.de/service/fritzbox/fritzbox-7581/knowledge-base/publication/show/3423_FRITZ-Box-reports-400-Bad-Request-when-accessed-with-own-domain-name-or-CNAME/

Here an screenshot for other affected people:

I stuck there for weeks, router update & android app not working anymore what a pity.

@bingo Thanks for the update!