this post was submitted on 20 Mar 2024
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I went trough 5 days of Rethink logs to confirm. Not a single call to a Google domain was allowed. DAVx5 works great.
Another user posted that Davx5 from Fdroid has no dependency on Google. Maybe you're using the Playstore version? I don't even have GApps to install the playstore.
I'm using the one on F-Droid. I do not have gapps on my devices.
What they say "no dependency on Google" they mean no proprietary blobs. That's true. The calls home to Google to check for internet activity are made by open-source software baked-into AOSP.
If you use a firewall to block these calls, then the OS says that you don't have internet connection and Davxx5 is dumb enough to take that as fact and refuses to sync. This is a known bug.
On custom roms like grapheneos you can change the domain it connects to. Om grapheneos it defaults to servers hosted by grapheneos.
That probably explains it. So your firewall isn't setup to block your phone from phoning home to the Graphene mothership then..
I'm sorry you're experiencing this bug. I'm not however. I even checked my pi-hole: the only access to connectivitycheck.gstatic.com comes from my wife's phone, which isn't hardened.
I vaguely remember doing some fiddling to the captive portal setting years ago. I probably found a way to disable the check altogether.