How to Block a Website Using Zonealarm

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Created in 1993, Check Point's Zone Alarm is a software firewall which blocks unauthorized access to your computer. It works by dividing your network access into zones. The trusted zone includes your local area network, files and printers, while the Internet zone is everything else. You can also block websites. This tool is ideal for parents who do not want their children to access some sites by accident or for employers who do not want employees going to certain sites during office hours.

  • Open Zone Alarm by double-clicking on the "Zone Alarm" icon in your command

  • Click on the "Firewall" tab on the left-hand side of the screen.

  • Click on "Zones."

  • Click on "Add."

  • Select the "Host/Site" selection.

  • When the popup box appears, the top item is "Zones." Click on the "Down Arrow" and click "Block."

  • Enter in the "Web Address" of the site you wish to block. Do not enter in http:// and the address, only the address. For example, type in "Myaddress.com" not http://myaddress.com.

  • Click on "OK."

  • Click on "Apply."

Tips & Warnings

  • Review your Zone Alarm logs on a regular basis, especially outbound traffic. Zone Alarm in learning mode will tell you which applications are asking for Internet access. If an application needs Internet access but keeps trying to connect to sites you find questionable, consider blocking the site, not the application.
  • You can also block IP addresses or IP ranges.
  • Add web addresses to your program so they are trusted sites. To do this, click on "Add" instead of "Block" in the instructions.
  • Class C subnet ranges cannot be blocked. The range for Class C subnet range is 10.0.0.0 to 10.255.255.255. This is not applicable in the free Zone Alarm version.
  • Use caution when blocking with ZoneAlarm or any similar personal firewall. You may find yourself unexpectedly unable to access websites you want. For example, if you block all of microsoft.com, your Windows computer will be unable to access security updates, drivers, patches and online help. While ZoneAlarm will show you what sites you have blocked, it does not tell you when you did so or what your intent was. Keep a log in Notepad to remind you of what you blocked, why you blocked it and when you blocked it so you can compare these facts to any connection failures you may experience.

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