Firefox?
ewentualnie
"Using a reverse proxy with Home Assistant
Home Assistant will now block HTTP requests when a misconfigured reverse proxy, or misconfigured Home Assistant instance when using a reverse proxy, has been detected.
If you are using a reverse proxy, please make sure you have configured use_x_forwarded_for and trusted_proxies in your HTTP integration configuration.
For more information, see the HTTP integration documentation.
Additionally, access to Home Assistant from the same IP address as a trusted proxy will be rejected if the request is marked as forwarded."
PS Ostatecznie zawsze możesz wrócić do snapshota, którego z pewnością sobie przygotowałeś przed wszystkimi radykalnymi zmianami w konfiguracji.