Install a firewall

A firewall allows you to control the flow of data to and from your computer in order to avoid any unwanted connections.

For example, it could prevent hackers from accessing your shared folders, or prevent a worm that has infected your computer from spreading to the rest of the network.

Make sure at least that the firewall included with your operating system is enabled.

Windows XP (SP3)

  1. Click the Start menu
  2. Click Control Panel
  3. Click Security Center
  4. Click Windows Firewall
  5. On the General tab, choose On (recommended)
  6. Click the OK button

Windows Vista

  1. Click the Start menu
  2. Click Control Panel
  3. Click Windows Firewall
  4. Click Turn Windows Firewall on or off
  5. Choose On (recommended)
  6. Click the OK button

Mac OS X 10.4

  1. Open the Apple menu
  2. Click System Preferences…
  3. Click Sharing
  4. Click Firewall
  5. Click the Start button
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