Auth and frontend not working

I am having issues getting the frontend to work with the new auth setup.

I had the same issue when updating to 0.74.2 (and somehow it fixed itself with some changes to the config, but mostly it seemed like after restarting it often enough). Now after updating to 0.75.3, I again get:

This site can’t be reached
192.168.0.31 refused to connect.
Search Google for 192 168 8123 states
ERR_CONNECTION_REFUSED

What’s the best way to debug this?

The relevant parts of my config are:

homeassistant:
  auth_providers:
    - type: homeassistant
    - type: legacy_api_password

frontend:

http:
  server_port: 8123
  api_password: !secret http_password

After commenting out:

# Checks for available updates
updater:

# Discover some devices automatically
discovery:

# Enables support for tracking state changes over time.
history:
  use_include_order: True

# View all events in a logbook
logbook:

logger:

recorder:

# Track the sun
sun:

# Weather prediction
sensor:
  platform: yr

# Configuring lirc for receiving IR button presses.
# lirc:

tts:
  - platform: google

device_tracker:
  - platform: nmap_tracker
    hosts: 192.168.0.101-200
    home_interval: 60
    consider_home: 600
    track_new_devices: false

And then adding it back in “slowly” with trial and error it eventually started working again with everything added back in.

Any idea what’s going on?

Cannot say what had happen without logs