How to Block an IP Address With a Firewall
The Windows operating system includes a built-in firewall tool, which is essential to keeping your computer secure and protected from outside threats. If you know that a specific outside IP address is attempting to gain unauthorized access to your system, you can block the connection by modifying the Windows firewall settings. When configuring the firewall, you can specify which range of IP addresses is allowed to communicate with your computer. All other addresses outside of the range will be blocked.
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Instructions
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Log on to your PC with an account that has administrative privileges. Only administrators can modify the system's firewall configuration.
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Open the Start menu and click on the "Control Panel" icon.
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Double-click on the "Windows Firewall" icon.
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Go to the "Exceptions" tab at the top of the window.
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Click on the "Add Port" button at the bottom of the window.
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Enter a name for the firewall configuration, use "80" as the port number and make sure the "TCP" option is selected.
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Press the "Change Scope" button. A new window will open in which you can specify the IP addresses you want to allow through the firewall. All other addresses will be blocked.
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Select the "Custom List" option and then enter the range of IP addresses you want to allow through the firewall. All IP address not included in the range will be blocked. Hit "OK" twice to save the configuration settings.
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References
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