Invalid local network URL You have configured an HTTPS certificate in Home Assistant. This means that your internal URL must be set to a domain covered by the certificate

When changing the local network URL in https://192.168.178:8123 I get the following message:

Invalid local network URL

You have configured an HTTPS certificate in Home Assistant. This means that your internal URL must be set to a domain covered by the certificate.
I don’t want to use a reverse proxy like Duckdns because I want to make sure that I can still reach my Home Assistant in my local WLAN if the internet goes down, but I am still connected to my router.

Does anyone have any ideas?

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DuckDNS is not a reverse proxy, it is a dynamic DNS service.

You can’t use SSL certificates for ip addresses, only domain names.

I think the best idea would be for you to pay for Nabu Casa for remote access.

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You seem to have missed out part of the address - was this in copying it into your post? Most likely you meant 192.168.1.178 or 192.168.1.78

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But to access NABU Casa url you also need Internet…

Yes, you are right. Correct Adresse is: 192.168 178.100:8123.
I think i solved it with the Hostname:
https://homeassistant:8123

This one was working without the error…

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Only for remote access. You can still use mdns or the ip address locally using http.

Can you explain how i can do this?

If it’s working for the past 9 months, don’t worry about it…