Disable internet 5.0

Posted on 2005-04-21
Last Modified: 2010-04-14
Running win 2K pro on 3 machines networked together.  The host machine i want to connect to the interent (it does that fine) the other two machines I want to prevent them from connecting to internet.  How do i go about that?  can it be done with passwords?  I need an answer today 4/21/05
Question by:dfte11a
    LVL 12

    Expert Comment

    There are lots of ways, with varying degrees of security, but we should know more about how these are hooked up.  Are all 3 connected to one router, which is also connected to the internet?   Or are they sharing a connection through the "host machine"?

    The simplest way is probably to remote the default gateway from the TCP/IP configuration.  This will not prevent them from connecting to machines in the same LAN segment,  but will make it impossible to communicate with machines anywhere else.    But we really need to know more about your configuration and why you want to prevent 2 of 3 from connecting to the Internet.

    LVL 16

    Assisted Solution

    If he is on a lan, setup in Internet Exploer > Tools > Internet Options > Connections tab > LAN Settings > Uncheck the automatically detect settings and check use proxy server and bypass proxy server for local address. Enter bogus IP and port info into the proxy. port 14000.
    Now it will attempt to look for a proxy when accessing the internet and fail :)

    Next step if the user is technically savvy and knows how to uncheck these settings. There is a registry entry that will hide the Connections tab in Internet Options.

    Here is the key to hide the connections tab from Internet Explorer options.

    HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel\
       Add Dword named ConnectionsTab
       Edit the value and change it to 1
         1 = hidden 0 = visible

    You can also disable other tabs in the same reg with dwords of:

    Author Comment

    This is for our church library, we don't want access to internet on two of the three machines.  The router is connected to the data port and the other machines are all connected to the router.  We still need for these machines to "see each other" but limit internet connectivity to only the host machine.
    Thanks for quick answer
    LVL 16

    Accepted Solution

    My solution will do just that. Checking the Bybass proxy server means they can still talk to each other behind the router.
    LVL 12

    Assisted Solution

    How much security do you want? In theory, giving physical acess to a machine means that somebody sophisticated enough can bypass's all a question of how difficult you want to make it for them.  

    What will these machines be used for?  Can you configure them so users do not have administrative rights?

    If you do what *both* Craylord and I suggested, it would take somebody pretty persistent to get around it...since it would require finding the router address and then modifying three different things in the system.  Any competent techie could do it, but it would take some time.  

    If you do these things *and* restrict users to a non-administrative login, then they would need not only more knowledge and more time, but they would probably need a bootable utility CD or USB key to get around the security.

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