Brad,
You can do it in various ways, either by setting up Microsoft Proxy Server
and using the following to articles:
164882 Practical Recommendations for Securing Internet-Connected Windows NT
http://support.microsoft.com/?id=164882
174785 Packet Filter Driver Blocks All Non-Proxy Requests
http://support.microsoft.com/?id=174785
Or look for a hardware solution like LinkSys or Netgear that would allow you
to setup a Port Rule by time of day:
Linksys Parental Controls - Web Access
https://linksys.custhelp.com/cgi-bin/linksys.cfg/php/enduser/std_adp.php?p_faqid=708
http://www.netgear.com/index.php
--
Hope this helps,
Mike Rosado
Windows 2000 MCSE + MCDBA
Microsoft Enterprise Platform Support
Windows NT/2000/2003 Cluster Technologies
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