Examine desktop firewall configurations to verify that outbound traffic is explicitly authorized |
All traffic outbound from the cardholder data environment should be evaluated to ensure that it follows established, authorized rules. Connections should be inspected to restrict traffic to only authorized communications (for example by restricting the IP addresses or ports or enabling content blocking). This query shows all desktop firewall rules that allow outbound traffic and allows you to determine which rules are excessive and need to be disabled or adjusted to disallow unauthorized traffic.
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Find more information on 1.3.4: Allow Only Authorized Outbound Traffic at Microsoft TechNet.