So for some reason in v2021.7.0 HomeAssistant introduced a bug that breaks a lot of systems that rely on its NGINX reverse proxy add-on to provide ssl capabilities. Thankfully the fix itself is pretty simple.

  • To begin, try to navigate to the site to produce the error, then in the HAS web GUI navigate to the Supervisor Logs (Settings>System>Logs)

  • Grab the IP that shows up in the error that reads

    "A request from a reverse proxy was received from XXX.XXX.XXX.XXX, but your HTTP integration is not set-up for reverse proxies"

  • From here navigate to your configuration file in your chosen method (/config/configuration.yaml) where we will make edits.

  • Add the following line, including the IP you grabbed from the logs

http:
  use_x_forwarded_for: true
  trusted_proxies:
    - XXX.XXX.XXX.XXX
  • Reboot the machine