You can edit out your password salt and secret.

Just to clarify, in case someone else is about to make the stupid mistake I almost made: I’m pretty sure @JasonBayton meant @vCentre should edit their message (above) which contains the salt and secret, not that they should edit those out of their live config.php on the server, as that would cause the loss of all existing passwords.

So I did some more digging and turns out this was all due to my having botched the migration. I had used the experimental upgrader script, which kept failing due to timeouts, so I went ahead and tried to finish it up manually. With everything else apart from the Android app working as expected, I was fooled into thinking I had nailed it. But with this issue persisting, I just had to check, and wouldn’t you know, there were still all these files lingering from the previous Owncloud installation that I hadn’t replaced.

Tl;dr; re-downloaded 9.0.52, replaced the existing installation with the files extracted from the download, and the Android app now also connects without issue.

@HucSte, I’m not sure your issue is related, but if you also migrated from Owncloud, you could try re-installing Nextcloud files afresh.

No worries, thanks for taking a look at this @tobiasKaminsky!

Forgot to mention that my installation is served over https too, on Apache. But for me there are no SSL errors to be seen either.

I just migrated from Owncloud 8.2 to Nextcloud 9.0.52. Everything else (i.e. the web interface, desktop client) seems to work just fine, but I can’t get the Nextcloud Android app to connect with the server. I can enter the URL (no errors), my login and password, but the ”Connect” button feels totally unresponsive, it does nothing at all no matter how much I tap it. No error messages are given by the app nor is there anything correlating with the attempts in server logs.

This happens on both my phone (Nexus 5X, Android M) and tablet (Samsung Tab 4, Android L). I also tried the Beta app from F-Droid and the issue is present there too. It’s also present in both my WLAN and when using a direct 3G connection on the phone (so I don’t think the WLAN router’s firewall is the cause either).

The Owncloud app on the same devices still works with the server, although I haven’t tried logging out and re-connecting it.

The server is on shared hosting where I have shell access.

Any suggestions?