WMS- and WFS-services not loading when operating behind cda firewall

I’m using QFIELD on Samsung S10e Android 12.
Due to corperate data access regulations the device must operate behind a firewall. Thus all my WMS-Services and WFS-Services are not loading. There’s a timeout notification for the layers. In my desktop QGIS everything’s working correctly. I have found out, that several IPs are beeing blocked by our firewall when starting QFIELD. One of them - the IP from germany is a open data host - so this a a reliable provider. Can someone tell me, which of the other IPs are needed to be adressed to run WMS/WFS-services in QFIELD properly?

grafik

the notifications I get from QField:


Imported from GitHub discussion by @Spacedatists on 2023-01-20T10:17:16Z