Http vs Https Connection

Hi, I have the following issue:

I use a NAS
When I call the surface I get displayed “unsecure connection” as it is a http-based.

When I call it from Firefox it is https, just as desired, I assume it’s from the option “only https in all windows”

So I searched for the “issue” -is it one?- and found a bunch of posts which at the end

confuses me even more.

When clicking at the button to the left of URL-path it says INAVALID certificate.

Does this mean a certificate of the browser (where I did nothing in this direction) or of the NAS? There I have a LetsEncrypt cert.

Summarized: Is it possible to get a https-connect?

Update: I then just found the Brave-Shield-Button: Played with the options “only https and upgrade to…” no success.

Does anyone have ideas?

Just occured, probably in the same context:

I created a link on the NAS for Pics-Release: When I call the link, I get error acc. attachment 2, saying allow Firewall access. Where is this?

UPDATE:
as this error occurs under each browser (Edge, FF, Brace) I resume it’s up to the machine: I looked in the WIN-Firewall settings, set a flag the Public-flag; no success.

Then I deactivated both networks: private and public…same result.

What an exhausting business. Can s.o. enlighten me?

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