Cannot connect to addons or services

Hi!

I have recently began encountering a strange issue where HA will not connect to external APIs like in openweathermap, nor will it connect to addons running on the local machine when searching by name, for example, I am running ZWave JS UI, and the addon hostname is “a0d7b954-zwavejs2mqtt”, but, if I enter ws://a0d7b954-zwavejs2mqtt:3000 it fails to connect, however, if I put in ws://localhost:3000, it does.

DNS is working perfectly fine on my network, and I can ping from a shell on the HA machine and it resolves places like google.com just fine.

I am running the latest version of HA as a Supervised installation on a Raspberry PI with fully updated Raspberry PI OS.

Am I missing something obvious here?
-Rick

That is an unsupported install method. Supervised requires Debian OS (no derivatives).

It is a raspberry Pi 4 with the latest Debian version - this is the output from “lsb_release -a”

Distributor ID: Debian
Description: Debian GNU/Linux 11 (bullseye)
Release: 11
Codename: bullseye

Is a derivative.