PeerBlock is a free and open-source personal firewall that blocks packets coming from, or going to, a maintained list of black listed hosts. PeerBlock is the Windows successor to the software PeerGuardian (which is currently maintained only for Linux). It blocks incoming and outgoing connections to IP addresses that are included on blacklists (made available on the Internet), and to addresses specified by the user. PeerBlock mainly uses blacklists provided by iblocklist.com. PeerBlock 1.0 is based on the same code as PeerGuardian 2 RC1 Test3 Vista version. It adds support for 32- and 64-bit Windows Vista, Windows 7, and Windows 8. When the PeerGuardian project ended, its developer Phoenix Labs encouraged current PeerGuardian users to migrate to PeerBlock. More information...
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