Avast Firewall Settings
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Courtesy AVAST Internet Security - Technical Support Database:
avast! 5.x: Configuring the firewall application rules in avast! Internet Security
https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=482&nav=0,66
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Internet Internet Security AVAST Firewall Settings
Internet Internet Security AVAST Firewall Settings