Start64!PeerGuardian 2 is Phoenix Labs’ premier IP blocker for Windows. PeerGuardian 2 integrates support for multiple lists, list editing, automatic updates, and blocking all of IPv4 (TCP, UDP, ICMP, etc), making it the safest and easiest way to protect your privacy on P2P.

PeerGuardian 2 is Open Source, meaning the program code is available online for anyone who wants it. Not only does this allow you to make modifications or even branch off into your own project, but it encourages peer review of the code making sure any bugs are eliminated swiftly. Because PeerGuardian 2 is Open Source, you can rest assured there are no backdoors or spyware included.


Important note for Vista x64 users

New in Vista x64, Microsoft requires all drivers to have a special code signature, or they won't load. They call this a security feature, but we believe this is basically snake-oil: although code signatures let you verify where the driver came from, it does not protect at all against a malicious driver (such as a virus).

Unfortunately, the certificate to perform this signing costs from $300-$500 USD/year. Until Phoenix Labs is able to afford one, Vista x64 users will need to perform the following steps.

  • Start -> All Programs -> Accessories -> Right click Command Prompt -> Run as administrator.
  • Copy the following exactly (without quotes): "bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS". Right click on the title bar, go to Edit -> Paste. Make sure what was pasted is correct, then hit enter to execute the command.
  • Reboot the machine
  • Now the first time you load PeerGuardian you will see a message like the below. If you performed the above steps correctly, it is safe to ignore this. You can make sure by turning on Show Allowed under settings, and making sure an IP scrolls by when you visit a website.


This build has been tested with the following Windows versions:

  • Windows 98 SE
  • Windows 2000
  • Windows XP
  • Windows XP x64 Edition
  • Windows Server 2003
  • Windows Server 2003 x64 Edition
  • Windows Vista
  • Windows Vista x64 Edition
  • Windows Server 2008 Beta

PeerGuardian - 64bit software