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3.13.6System and Communications Protection - Derived

Derived Requirement

>Control Description

Deny network communications traffic by default and allow network communications traffic by exception (i.e., deny all, permit by exception).

>Discussion

This requirement applies to inbound and outbound network communications traffic at the system boundary and at identified points within the system. A deny-all, permit-by-exception network communications traffic policy ensures that only those connections which are essential and approved are allowed.

>Cross-Framework Mappings

>Assessment Interview Topics

Questions assessors commonly ask

Process & Governance:

  • What policies govern denying network communications after inactivity?
  • What inactivity timeouts are defined for network sessions?
  • Who approves network session timeout configurations?
  • How do you differentiate timeouts for different connection types?
  • What governance ensures inactive sessions are terminated?

Technical Implementation:

  • How do you implement network-level inactivity timeouts?
  • What firewalls or network devices enforce session termination?
  • What timeout values are configured for different protocols?
  • How do you monitor and log inactive session termination?
  • What controls prevent indefinite network connections?

Evidence & Documentation:

  • Can you show network timeout configurations?
  • What evidence demonstrates inactive session termination?
  • Can you provide logs of network sessions terminated by timeout?
  • What configurations enforce inactivity-based denial?
  • What audit findings verify network timeout compliance?

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