Examine all "deny" rules to verify that all other inbound and outbound traffic is explicitly denied |
Examination of all inbound and outbound "deny" rules to make sure that there is a firewall rule to deny traffic for undocumented inbound and outbound connections can help to close gaps that would allow unwanted and bad traffic. Using an explicit "deny all" or an implicit deny after allow statement can help to close such gaps.
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Related Alerts and Reports:
1.2.1.b: Traffic Limited to Necessary
Examine firewall configuration rules for inbound and outbound connections to verify that it’s limited to which is necessary
1.2.2.a: Protect Configuration from Unauthorized Access
Examine desktop firewall configuration settings to verify they are secured from unauthorized access
1.2.2.b: Configurations are Synchronized
Examine desktop firewall configurations to verify they are synchronized
Find more information on 1.2.1.c: Deny All Other Traffic at Microsoft TechNet.