I am new to HA, but I originally set it up and got it working on an old Raspberry Pi 3 that I had, which work well, but as I started adding more to it, it started tapping out.
So I decided to take an old Dell tower that I had, load Ubuntu on it, and then setup a VM running HA OS. I have it setup and installed and I am using the network in bridge mode so that the VM has direct access to my network. I can get to the Observer at :4357 just fine - even from another computer in the house, but I cannot get into the backend GUI at :8123. It just keeps saying connection failed. I’ve tried it with the IP and with homeassistant.local, neither works. I can ping the IP of it, but can’t get into it. There are no restrictions on the network either.
Anything I’m missing?