Hi Albert,
Did you try different browsers? And on your phone from the mobile network?
There is also a log on https://[your-home-assistantaddress]/hassio/addon/core_duckdns/logs
Does that give useful information?
Did you consider NabuCasa:
Can yout still connect to HA locally? If so, whats in die HA logs?
Do you get more information in your browsers debugging console? (F12)
You disabled the trusted_proxies setting in HA, thats usually results in an http/400 error.
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Still not working. Does anybody knows a paid service that can assist you remotely with HA configuration?
Did you get this working. I have the same problem
I had the same issue after about 90 days of using remote access. I thought something was wrong with my DuckDNS addon or I had to use the LetsEncrypt addon separately. I also do NOT use the NGINX addon.
After looking through this thread, I found above where the configuration.yaml had two entries for internal and external URL. This was not a part of my config.yaml nor was it mentioned in the 2 YT videos I followed to create my remote access.
Once I added those two lines, everything worked just fine. I’m curious why it worked previously for several months without those entries, and now won’t…but I’m happy with just having it work!