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Implement Microsoft Entra Private Access for Active Directory domain controllers

Implementation Effort: Medium

User Impact: High

Overview

Microsoft Entra Private Access enables secure, policy-driven access to on-premises Active Directory domain controllers by removing broad network trust and enforcing Zero Trust principles. Instead of exposing domain controllers over flat networks or VPNs, access is brokered per-resource using identity, device health, and Conditional Access policies.

Implementation steps:

  • Install Components: Deploy Private Network Connector, Private Access Sensors on domain controllers, and Global Secure Access Client on endpoints
  • Configure Applications: Publish domain controllers and define Service Principal Names (SPNs) for protected resources
  • Apply Security Policies: Create Conditional Access policies with MFA requirements and assign to synchronized AD users
  • Test and Enforce: Validate functionality in audit mode, then switch to enforcement

This approach eliminates implicit network trust, minimizes attack surface, and ensures that only authorized and healthy users/devices can access domain controllers, aligning legacy authentication with modern Zero Trust security. Specifically:

  • Zero Trust Network Access (ZTNA): Replaces traditional VPN broad network access with granular, application-specific access
  • Enhanced MFA Coverage: Extends multifactor authentication to legacy on-premises applications that don't natively support modern authentication
  • Privileged Access Protection: Secures domain controllers with enforced MFA and Privileged Identity Management (PIM)
  • Lateral Movement Prevention: Eliminates excessive network access and prevents unauthorized lateral movement within the network

Reference