I also self-host nextcloud with a proper url and use the android client on graphene.

For some reason I never nailed down, the app was particularly picky to my hairpin routing. Ij that I could access it from outside the LAN, but not inside the LAN.

I fiddled with a bunch of stuff on the server, the router and phone ans then it just started working and has for years,

The other issue I had, was the NC app being picky with self signed SSL certs. I have had zero issues with that since I started using Traefik and LetEnceypt.

There is ligh at the end of the tunnel, I've had my setup stable for years.

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I would think DNS was the problem as well except that I can browse the host in vanadium. It is as if the nextcloud client app no longer uses the DNS settings of the OS.

I tried two other hosts, one that exists and one that does not. I got two new errors:

I tried another host on the network and got a different error: "server not found" I have all of my self hosted services going through traefik reverse proxy. And this process works fine in an android VM.