MITRE – Disable or Remove Feature or Program

Amazon Web Services – Operational Best Practices for CMMC 2.0 Level 2

CMMC Level 2 Assessment Guide

Help Desk Geek – How to Find Open and Blocked TCP/UDP Ports

netwrix – How Insecure and Vulnerable Open Ports Pose Serious Security Risks

Wright Brained – CMMC Practice 3.4.7 – Ports, Protocols, Programs Functions, and Services

Georgetown University – Restricted List of Ports, Protocols, and/or Services

DoD Instruction 8551.01 – Ports, Protocols, and Services Management (PPSM)