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Blocking Facebook. Cert error and ugly Blocking page missing CSS?

I have blocked Facebook and a few other HTTPS sites blocked via Web Protection, and it works fine. BUT When i visit https://facebook.com I get a cert error:

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Your connection is not private

Attackers might be trying to steal your information from www.facebook.com (for example, passwords, messages, or credit cards).

 

NET::ERR_CERT_AUTHORITY_INVALID
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And when I visit another Facebook site, like https://facebook.nl the blocking site looks very bad. LIke there is no CSS file linked, no pictures are shown.
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Content blocked

While trying to retrieve the URL:
The content is blocked due to the following condition:
The URL you have requested is blocked by a blacklist. If you think this is wrong, please contact your administrator.
Your cache administrator is:
jwilden@gmail.com



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  • Sophos HTTPS signing CA must be trusted by your browser. IE and Chrome use Windows built-in trusted CA store, Firefox have its own authorities list.

    If you have AD environment you can push it via GPO to Windows trusted CA store, for Firefox you have to do it manually (as far as I know) on every client.