Can not access Node RED UI

I am new to Home Assistant and have just installed it.
Everything is working fine and I have made some automations, but I would like to try Node Red.
I installed it by configuration/Add-On-Store/Node-RED.
I start it and push “Open Web UI”
and get this message “502: Bad Gateway” I tried to reinstall but get the same result.
The installation is on a RPi4

set

ssl: false

Sorry
Still: 502: Bad Gateway

try something like:
credential_secret: hass

can you show a screenshot of how you are doing it and where?

Nope!
Still same…

Where is this?

If you don’t tell what you do and keep telling “it does not work” help will quickly fade out.

Suddenly it started
Thank You…

That was not “suddenly” that was due to those commands. Although, good luck.

I did exactly what You told me.
Change ssl in config and put hass as credential secret.
But I was to trigger happy with my answer.
It just took some time…

I was having the same issue, fresh install of core-2021.2.3 with Home Assistant OS on a pi3, after some 5 minutes or so the ui finally rendered.

made configuration changes

old

credential_secret: hass
ssl: false

new

credential_secret:
ssl: true

was tempted to change this but left alone

require_ssl: true