Default domain policy is blocking website

The default domain policy is blocking access to . First I am redirected to accept the security certificate for the https.... then it gets redirected to internet page cannot be displayed. It is not a problem with our NBFW cause I am able to access the site with a computer not joined to the domain.

In the GP, but there are no security and privacy settings configured under user configuration - policies - IE Maintenance, security etc. "Do not customize security zones and content ratings" are both set.

If anyone can redirect me to other areas to check, that would be great. Thanks in advance for your time and help.
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GPresult is your friend when trying to troubleshoot GPO issues.

Not a direct answer to your question, but GPresult will show you what all is getting applied & from where. It's far easier than pouring through every GPO manually.

Might there be a proxy set for the domain machines forcing those PCs to go through a proxy server that is having problems?
Is there something messing with the CTL (Certificate Trust List) or what not causing problems? Not that likely given the symptoms, but possible.

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