Could not sync via Wireguard

[Don-Angelo]

I observe the following situation on my Google Plixel with GrapheneOS:
My Opencloud instance is only accessible in my private network or via Wireguard.

Scenario 1:

• Initial account login within private network
• In my private network everything works fine
• If i leave my private network the sync via Wireguard seems not to complete (infinite loading), accessing the Opencloud instance via web browser works still fine

(Removing all app data after scenario 1)

Scenario 2:

• Initial account login via Wireguard (and mobile data, not wifi)
• Connected via Wireguard everything works fine
• If i connect via WiFi to my private network everything works fine
• When i leave the WiFi and test the connection via Wireguard the sync seems not to complete (infinite loading), accessing the Opencloud instance via web browser works still fine

From the logs i extract the following error (i replaced the domain with ):
E: 2026-03-18 15:17:20:288(RemoteOperationResult.java:120)---------------------------------
Create RemoteOperationResult from exception.
Message: UnknownHostException: Unable to resolve host "cloud.int.": No address associated with hostname
Stacktrace: java.net.UnknownHostException: Unable to resolve host "cloud.int.": No address associated with hostname

[guruz]

I haven't read your setup in detail, but java.net.UnknownHostException is something triggered by the DNS response, so it's not on OpenCloud application level (probably).

Are you sure your VPN configuration is correct with regarding to name servers?
Does restarting the OpenCloud app do something?

[Don-Angelo]

I host every application the same way, the *.int wildcard in my public DNS points to the Wireguard IP of my nginx proxy manager (yes i know, bad practice but works fine) and i am reaching all applications with my browser over Wireguard. I even re-used my proxy entry which was used before by my nextcloud (worked flawlessly in the same setup).

In my private network i have a DNS setting in the router for my *.int wildcard to reach directly to the IP of the nginx proxy manager.

So you have two different responses for the same URL depending in which network i am.
In private network cloud.int.XXX.yy -> (proxy)192.168.x.y
Via public DNS when not in private network cloud.int.XXX.yy -> (proxy)10.x.y.z

edit: Of course i tried restarting the app and the phone multiple times.