Are you using an app or device that won't work while McAfee Internet Security is running? This can happen when "ports" have been blocked or limited. You can open a port so the device or app can access the Internet.

Open a port

  1. Open McAfee Internet Security.
  2. Expand Web and Email Protection.
  3. Click Firewall.
  4. Click Ports and System Services.
  5. Click Add.
  6. Enter a program name, category, and description.
  7. Enter the TCP or UDP port that you would like to open.
  8. Change the drop-down option for Open Ports to All PCs.
  9. Click Save.

McAfee Internet Security > Ports and System Services > Device Name

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