Block a particular webpage on particular clients

Hello, I have to block a particular page (mind you, not a whole website, just a page) for some clients on a network I manage.

The server is SBS 2011, all the clients are W7 Professional.

The network is behind a Zyxel firewall.

What do you think would be the best, fastest method to make that particular page inaccessible for those clients?

Thanks.
Daniele BrunengoIT Consultant, Web DesignerAsked:
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Cris HannaSr IT Support EngineerCommented:
There is nothing really native that will make this fast, but you should be able to use this article and put in the full URL to that page and block it.
http://www.grouppolicy.biz/2010/07/how-to-use-group-policy-to-allow-or-block-urls/

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bbaoIT ConsultantCommented:
as the page access is AD users specific, the best way in a SBS environment is to block the page per users using Forefront Endpoint Protection and its Windows Client, if in use.
Cris HannaSr IT Support EngineerCommented:
I'm pretty sure that EndPoint Protection on the Server is no longer available except through System Center.   And that's not cheap
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Cris HannaSr IT Support EngineerCommented:
Following up, I don't use software on the server to do this kind of thing for my clients.    All it takes is one update to screw the server up. We use a Universal Threat Management (UTM) Firewall that is AD Aware.
Daniele BrunengoIT Consultant, Web DesignerAuthor Commented:
I will test something tomorrow and let you know.
Daniele BrunengoIT Consultant, Web DesignerAuthor Commented:
The linked article works, BUT it only works on Internet Explorer. Sites are viewable on Chrome. I need to block any browser.
Cris HannaSr IT Support EngineerCommented:
Then you'll need 3rd party software or AD integrated  firewall
Daniele BrunengoIT Consultant, Web DesignerAuthor Commented:
I managed to do it using the content filter on the Zyxel firewall. I created a group containing all IPs of the machines I need to control and assigned to it a filter rule containing the urls I need to block.
Cris HannaSr IT Support EngineerCommented:
That certainly will do, but that's a lot maintenance keeping track of ip addresses.  That is why an AD integrated solution is better but your call
Daniele BrunengoIT Consultant, Web DesignerAuthor Commented:
I have a very low budget at my disposal, so I guess I'll have to stick with this. It's a school network, each classroom has a notebook and those are the machines I needed for the filter. The notebooks will not be growing in number, since we don't have any other classrooms. They will be replaced sooner or later, but not soon.
Daniele BrunengoIT Consultant, Web DesignerAuthor Commented:
I had to take the only route available with the resources at my disposal.
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