@Inali
Thank you for the effort, maybe this site helped a little bit. The solution i've found is a simple: sudo ufw allow out on waydroid0 to any. I was (and still am) confused about the 2 devices and how they "work" together. Now that i know which interface to deal with i can, of course, precise this rule, but i have another (Android-) firewall in the waydroid container that can handle this.

Hello all,

when i connect bluetooth mouse & keyboard to my Fairphone 4, connect the phone to my TV with a USB-C-to-HDMI-cable and start Waydroid, Waydroid starts correctly, but crashes and restarts as soon as i hover with the mouse cursor over the Waydroid window. There aren't any useful informations when starting Waydroid from Terminal, even with --verbose and/or --details-to-stdout enabled.

Anyone has an idea what the problem is?