Cornell University

Technology Services

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Enabling the Windows XP Personal Firewall Feature on your Home Computer

Windows XP comes with a personal firewall that is very easy to use. You should take advantage of this feature to protect your computer from attacks. The XP Personal Firewall allows you to connect to the Internet while preventing the Internet from connecting to you. By using it, you ensure that the only Internet communications your computer is involved with are ones that your computer initiated.

To Install the XP Personal Firewall:

  1. Click Start
  2. Click Settings
  3. Click Control Panel
  4. Select Network Connections
  5. Select the connection that you use to connect to the Internet
  6. Right-click the connection icon and select Properties from the pop-up menu.
  7. On the Connection Properties window, click on the Advanced Tab
  8. Under the Internet Connection Firewall section, check the Protect my computer box
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    Note: Steps 9 through 19 are required to use Sidecar or CUWebAuth to access kerberized Cornell network resources.

  9. Click on Settings.
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  11. Click on Add
  12. Create a new service called CIT Modified Kerberos
  13. In the next box down, enter 255.255.255.255
  14. In the next box down, enter 913
  15. Make sure it is set to TCP
  16. It should look like this:

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  18. Click OK to close the Service Settings window
  19. Click OK to close the Advanced Settings window
  20. Click OK to close the Network Connection Properties window
  21. You should now see a small lock on the icon for the network connection - this indicates that the firewall is enabled on that connection.

Disabling the XP Personal Firewall

If you ever need to disable the XP Personal Firewall, just un-check the Protect my Computer box mentioned in the instructions above.