You can also restrict internet access via the registry or IE's proxy
settings on the Internet Options...Connect tab, LAN settings button. Set it
to use a non-existent proxy server and then lock out access to the Internet
Options via the registry setting "NoBrowserOptions" below. Corresponding
registry entries re the proxy settings are also below..
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet
Settings]
"MigrateProxy"=dword:00000001
"ProxyEnable"=dword:00000001
These settings enable the use of a proxy server.
"ProxyServer"="
http://ProxyServername:80"
Contains the address of the Proxy server. Since we want to block web
access, just fill this in with a few random characters.
"ProxyOverride"
Use this setting if there are websites that you want your users to have
access to. Addresses should be separated by a semicolon (
.
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Internet
Explorer\Restrictions]
"NoBrowserOptions"=dword:00000001
This setting prevents users from opening "Internet Options" and
changing the Proxy settings back to default.
Other restrictions you may find useful are in this article:
The restrictions that are available to Internet Explorer 6.0 SP1
http://support.microsoft.com/default.aspx?scid=kb;en-us;823057