How can I block some PCs to the Internet ?

My boss is asking me to block some PCs to the Internet but can still get email using POP3.
What's the easy way to do?

Environment :
Server : 1 x Windows 2003 Standard Server
PCs : 10 x PCs XP Professional SP2
PCs software: NAV version 10
Network Media: Standard Cat 5 Cable
Switch : Simple 16 ports 10/100 Mbps switch hub ( Non-management module )
Router : ADSL modem to Internet

Joe_LAIAsked:
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lk-dataCommented:
You can do it with an IP Security Policy in Group Policy - Computer Configuration | Windows Settings | Security Settings | IP Security Policies. If you've already assigned an IP Security Policy then edit it to include the blocking of port 80 and 443.
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Joe_LAIAuthor Commented:
Is it doing on the server ? All PCs are using manually IP address. No using DHCP at router or server.
PCs IP setting:
IP address 10.0.0.100 - 110
Subnet Mask 255.255.255.0
Default Gateway: 10.0.0.1
DNS : 10.0.0.10
Server  IP setting:
IP address 10.0.0.10
Subnet Mask 255.255.255.0
Default Gateway: 10.0.0.1
DNS : 10.0.0.1
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lk-dataCommented:
Are yout PC's in a Domain?

If yes then you do it on the Server, and it will be put on the workstations at logon. Otherwise you have to do it on every local Workstation, then you have to be sure the users can't access the Group policy settings, or they can remake the settings if they know how to do that...

The IP address has nothing to do with this policy.
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Joe_LAIAuthor Commented:
Yes, all PCs are in a Domain.
How to select block PCs to IP Security Policy
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Joe_LAIAuthor Commented:
I tried to setup but not working. Any other way to do that ?
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lk-dataCommented:
I found this site, with some screendumps on:

http://www.petri.co.il/block_web_browsing_with_ipsec.htm

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lk-dataCommented:
The same site in the buttom there is this link:

http://www.petri.co.il/configuring_ipsec_policies_through_gpo.htm

This is the way to do it on the server, and let the logon distrubute it to the workstations, when the users logon the domain.

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smittyboomCommented:
Simple way to do it.
Open IE>Internet Options>Connections>LAN Settings>Check Use A Proxy Server>type 0.0.0.0. in the box and check the bypass proxy for local sites.
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Sci-Fi-SiCommented:
Nice one smittyboom, I like the cut of ya jib ma' boy what can I add to that?

Problem solved
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lk-dataCommented:
That's too easy to undo, and the group policy this is one thing you only have to do once, then all there logon to the domain get this group policy, and can't browse the web.
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