Need to restrict browsers in domain to certain sites

I have about 150 domains (currently in an Excel spreadsheet) that I want to restrict users to system-wide. What's the best way to do this?

1.  Can I import from the above-mentioned spreadhseet?
2.  Is GPO the best way to do this? Anyone got an example?

Much appreciated...

Amaca
amacaAsked:
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scrmcnaCommented:
Do you have any kind of firewall on your network?
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luv2smileCommented:
Your best bet would be to use a hardware firewall to accomplish this. The next best option would include to use a proxy server to control access.
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amacaAuthor Commented:
There's no firewall. Not sure I could get this customer to go that direction...they're thinking more IE Content Advisor.
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mcmaniCommented:
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amacaAuthor Commented:
Don't understand...the link seems to be to a hardware vendor solution. Although that would solve it, it's not what I'm looking for or able to implement at this time.
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scrmcnaCommented:
If GPO is working correctly at your site, you should be able to go to a group policy and go to User Config>Windows Settings>IE Maintenance>Security>Security Zones Click on the Import the current security zones and privacy settings, then click on modify settings and enter all of your sites.  I don't know of a way to import them.
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scrmcnaCommented:
You may want to go to Content Ratings instead of Security Zones.  Then import, then the Approved sites tab and enter your web sites and tell them never to allow.
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