If you want to force users to use a proxy from the office you have to
deny direct access to the internet.

Configure IE to "discover" proxy servers and disallow all access to the
Internet that is not through the proxy server. There will be some
exceptions that you might have to make however you will not be able to
force the use of a proxy any other way.

A quick google turned up this however there are other methods available
if you continue searching.

http://www.isaserver.org/tutorials/Configuring_Automatic_Discovery_for_I
SA_Server_Clients.html

Danny wrote:

> On Thu, 28 Oct 2004 12:27:31 -0700, Ryan Parrish
> <ryanp (at) foxracing (dot) com [email concealed]> wrote:
>
>> We are trying to implement a GPO that forces all users/computers to
>> use a proxy sever for there internet access in the company, but
>> have hit a snag. We have lots of laptop users that we found during
>> testing when they take there laptops home they can access the
>> internet using there own ISP since we set the policy to use a proxy
>> server that is not available to the outside internet, thus they get
>> no internet access. Has anybody dealt with this kind of situation
>> before? Is there a way to set a GPO to only be active during
>> business hours?
>
>
> How about using a seperate web browers, say Firefox, for use on the
> road; when outside of the corporate LAN?
>
> ...D
>
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