Hello, I have the same problem (no host internet connection) so I can’t update my supervisor to latest one (mine now 2023.1) and can’t find or update my add-ons.
I am using HAOS on a Virtualbox, I can access it externally through Cloudflare and using HACS normally (can install and update HACS add-ons)
I have tried both Ethernet and WiFi connection on my host Windows 11 laptop, changing DNS and rebooted network, home assistant server and restarted the VM manytimes.
Even I decided to install a fresh HA server, but it stucks on the onboarding screen and I think it is because of internet connection also.
Only worked after disabled the network check from HA terminal.
Yes, we managed to restore connection to Github servers from our network.
So far I am not 100% sure what was the cause, but what we did was accessing the modem UI through Internet Explorer and deactivate the firewall there. This was the only way to access our Technicolor TC4400 admin dashboard… We also set DNS addresses inside Home Assistant but I don’t think this helped in solving the issue since our router already had proper DNS settings (tested with 1.1.1.1 and 8.8.8.8).
I’ve also seen some other users claim Githubs server issues have been solved yesterday, so this adds to the overall confusing situation…