- 1). Log in to Windows Vista. Make sure that the account you use to log in has administrative privileges, so that you can change Windows Firewall settings. Depending on how your computer is set up, you may be unable to change Windows Firewall rules without administrative access.
- 2). Open the Control Panel. Click on the Start menu and open the Control Panel. Next, click on "System and Security" in the Control Panel and then click on "Windows Firewall."
- 3). Review the Windows Firewall options screen. Before blocking ports in Windows Vista by using the firewall, make sure that the firewall is active. Next, click on "Advanced Settings" to bring up a configuration tool for the firewall.
- 4). Find your blocking rules. If you need to block a port from communicating from your computer to the Internet, set Outbound Rules in the Advanced Settings screen. If you want to block applications from sending data to your computer from the Internet, you must set Inbound Rules to block ports. The Inbound and Outbound Rules can be accessed from the left column of the advanced firewall setup screen.
- 5). Add new rules. To add a rule, make sure you are looking at the rule list that corresponds to the type of rule you are creating (for example, if you are blocking an incoming port, make sure the screen is showing a list of inbound firewall rules). Next, click on "New Rule" in the right column on your screen. Select the radio box next to Port to block a specific port. Provide the rule wizard with the ports you want to block, and follow the on-screen instructions.
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