How to forcing user to insert proxy server ip to use internet

Hi Experts
i need to forcing users in my ISA 2006 environment to configure proxy (in internet explorer settings)
so if any user remove proxy server ip the internet not work
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You should push proxy settings to the user using GPO, you should also block any port 80 outgoing traffic on the ISA from the LAN with the exception of the proxy server as well as any server you do not want/need to go through the proxy.

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MASWORLDAuthor Commented:
Thanks i will try and inform
ChrisSenior Technical ArchitectCommented:
make sure if you are using newer versions of Internet explorer you use Group Policy preferences to set the proxy server and other settings as it won't apply to higher versions i think 9 and upwards but definitely 10
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