Hi Henrik, is it possible this refers to a "personal certificate" installed on Windows (or in Firefox) that the site requires for you to authenticate to the site?

I don't know whether the Enterprise Roots setting handles those or whether Firefox needs you to import them manually.

To see what personal certificates are currently in Firefox's built-in certificate store, either:

• "3-bar" menu button (or Tools menu) > Settings (previously "Options")
• type or paste about:preferences into the address bar and press Enter/Return to load it

In the search box at the top of the page, type cert and Firefox should filter to the "View Certificates" button, which you can click.

Click the "Your Certificates" tab (first tab) to see what Firefox knows about. Hopefully this matches the equivalent list in other browsers (not sure what that looks like in Chrome/Edge).

Thanks jscher for the reply!

Yes it is a personal certificate and it was showing up under "your certificates". But today for some reason it works again. Maybe a server side problem but strange it worked with the other browsers.

Thanks again for your prompt reply.

br Henrik