Migrated Server: Certificate issues on Android (web and client)

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1

Migrated my Nextcloud 21.X.X VPS from one KVM box to another.

Now on 3 different Android devices (on which I had previously signed in with the “old” NC instance).

I use HAProxy on my PfSense box, which is where the certificate is.

When I try to re-set up the NC Android app, I get “Unknown server error” and when I try to access it via browser (Chrome and Samsung browser behave the same way), I get a certificate error. If I ignore the certificate error, I can get to the instance and log on.

I don’t have any issue on desktop clients.

Behavior is the same whether I am on the LAN, or not.

2

is likely the cause of an issue. You have no way to ignore certificate check in the app and Android is really picky in terms of certificates and TLS (for a good reason) so I would start troubleshooting there.