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  ZoneAlarm Pro Firewall 7 Mar 18

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  SafeSquid Business Edition 16 Apr 15

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  PeerBlock 24 Feb 15

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  Agnitum Outpost Firewall Pro (64-bit) 22 Oct 15

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  Look 'n' Stop Personal Firewall 23 Sep 15

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  Armor2net Personal Firewall 28 Oct 15

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  PC Tools Firewall Plus 27 Apr 18

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  Using Internet Security and Acceleration (ISA) Server 2000 as a Firewall 21 Sep 15