I just updated and the sync occurred without the error, so yes it looks fixed.
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.
PS: Outlook w/ CalDav plugin works as well.
Sounds like a connectivity/internal network problem of your WiFi. Can you please post
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.
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:
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!