Untrusted connection error message on the computer at home, but can successfully connect to work

I've been connecting to this site for some time without problem (a notebook online for school son), but yesterday when I tried to connect from machine at home, got "this connection is Untrusted" error message. However, I was able to connect without problems to work today, but having the same problem at home again. Is this an indication that my home connection is somehow compromised? How can I check? Other sites seem to be working properly.

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The server sends all the intermediate certificates?

You can check the certificate through a site like this string:

Tags: Firefox

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