Untrusted connection on EVERY WEBSITE
No matter what website I try to connect to, I get the "This connection is untrusted" error. This happens in private browsing too and I've checked that my computer's internal clock is correct. This happens on any computer I connect to my network. (I've already tried the obvious stuff like rebooting my modem, computer and router.) My ISP says that everything seems fine on their end, but I don't know what else I can fix.
Does anyone know what might help?
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Could you copy/paste the error text you're getting? In particular, there is an error code usually in parentheses with words separated by underscore characters.
Does the error also occur in other browsers that use the "system" certificate store (e.g., IE and Chrome on Windows, Safari on Mac)?
Does your firewall/router/modem do any kind of filtering of secure sites? In order to do that, the device would need to send a fake certificate to Firefox, otherwise it could not decrypt the communication.