Blocking sites

I need to block some specific internet sites on a Domain Organizational Unit only can someone help me out? I'm on a Windows 2008-R2 domain.
Thanks in advance.
narce100Asked:
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Will SzymkowskiConnect With a Mentor Senior Solution ArchitectCommented:
You can accomplish this via Group Policy using "Security Zones and Content Ratings". The link below provides all of the steps including screenshots to accomplish this.

Security Zones and Content Ratings GPO - http://www.grouppolicy.biz/2010/07/how-to-use-group-policy-to-allow-or-block-urls/

Personally, i think that if you are wanting to block sites from a business perspective you should be installing some sort of firewall or proxy server which will do the content filtering for you. This way you can monitor traffic and also have instant change control for this. Using group policy will work but it is limited in that you need the clients group policy processing to take place to grab new policies if they have been published.

Will.
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mcj2006Connect With a Mentor Commented:
There has to be a better solution available then the one I'm about to give but here is a quick and dirty way.
Assuming you do not need to retain their current hosts file you could add a group policy for the OU. Add a logon script to User Configuration - windows settings - scripts.

Make and add a .bat file. Example.

hosts.bat

@echo off

set hosts=%systemroot%\system32\drivers\etc\hosts

attrib -r %hosts%
echo 127.0.0.1		siteyouwanttoblock.com>%hosts% 
echo 127.0.0.1		siteyouwantalsoblock.com>>%hosts%
echo 127.0.0.1		site3.com>>%hosts%

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edit. forgot to mention. The first site you're blocking needs 1 > this overwrites existing hosts file with a new one. To append and not overwrite the rest need 2 >>
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