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How to use Windows SBS to manage Internet security

Jonathan Hassell EXPERT RESPONSE FROM: Jonathan Hassell

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QUESTION POSED ON: 13 November 2007
I use Windows Small Business Server 2003 Standard Edition. I configured two network adapters: one for the local domain and another to connect to an ISP. I use SMTP in Exchange to send email and a pop3 connector to retrieve them. I discovered that any clients in my domain who put IP Server as their gateway can access the Internet. How can I fix this problem and prevent all users from accessing the Internet using SBS server? (Note: I have ISA 2006 to control the Internet in my domain.)

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EXPERT RESPONSE
It sounds like you have a bit of a problem on a couple of fronts:

  1. Your users should not have permissions on their local machines to change network adapter information, including the gateway address.

  2. You have an ISA Server rule problem that's allowing unsanctioned clients access to the Internet.

  3. ISA Server 2006 is not supported on Small Business Server environments.

SBS is meant to be at the edge of your network. It's not meant to sit on your network and collect mail, which is probably where the "hole" allowing clients to access the Internet through the SBS box is residing.

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