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Protect Active Directory Domain Services (AD DS) with a tiered access design, not a vault alone. Classify accounts, devices, and systems by what they can control; use separate least-privilege accounts for each tier; and start privileged sessions from hardened, dedicated workstations trusted at the same level as the target. Privileged access management (PAM) tools can add credential vaulting, approvals, and temporary elevation, but they cannot make an untrusted computer safe.
Start with trust boundaries, not a PAM product
Microsoft’s AD DS tier model groups systems and administrators by the highest level of control they exercise. A system that can administer or recover a domain controller is effectively as sensitive as the domain controller, even if its everyday purpose is backup, monitoring, patching, endpoint detection, or virtualization. Classify by effective control and credential exposure—not by a server’s name, location, or primary job.
| Tier | Typical scope | Examples |
|---|---|---|
| Tier 0 | Identity control and recovery | Domain controllers, privileged identities, AD FS, AD CS, Entra Connect, and systems or agents able to administer or recover these assets. |
| Tier 1 | Server and enterprise application administration | Member servers, enterprise applications, and management systems that control those systems. |
| Tier 2 | End-user devices and user support | End-user computers, help desk and device support, and end-user account administration. |
The exact boundary depends on your environment. For example, a backup platform with the ability to restore a domain controller or a hypervisor administrator who can control domain-controller virtual machines belongs in the Tier 0 trust boundary. Network segmentation can help enforce tiers, but it does not replace logical privilege boundaries. Microsoft summarizes the principle as: “Containment, not perimeter, is the boundary.” See Microsoft’s AD DS Tier Model for Privileged Access Security in Windows Server, which lists Windows Server 2025, 2022, 2019, and 2016 applicability.
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Include human and service accounts, endpoints, directory components, management platforms, and recovery tools. For each, ask what it can administer, access, or restore—and which credentials may be entered on it. Place it in the highest applicable tier. A perimeter-network location or operations-focused label is not evidence that a system is low trust.
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Build a tier-matched administrative path
A privileged session begins at the device where the administrator enters credentials. For each tier, use a dedicated, hardened privileged access workstation (PAW) appropriate to that target. Keep the PAW reserved for administration rather than email, everyday browsing, productivity software, or unmanaged applications. Do not enter Tier 0 credentials on a lower-trust productivity computer.
Apply the same trust rule to every intermediary. A vault, bastion, jump server, remote gateway, or management service participating in a Tier 0 session needs Tier 0 protection. A credential vault does not neutralize a compromised endpoint: if an attacker controls the device used to request or enter privileged access, the session remains exposed. Do not rely on a later sign-in restriction to prevent credential exposure during an attempted logon.
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Provision a PAW as a managed security device
A retail laptop is not a PAW simply because an administrator uses it. Microsoft’s dedicated-device implementation guidance, current on September 27, 2026, calls for a supported Windows device and includes TPM 2.0, UEFI Secure Boot, BitLocker, and virtualization-based security among its hardware prerequisites. It also covers enrollment, hardening, management, monitoring, and exclusive privileged use. Check Microsoft’s Secure devices and workstations guidance for current release and management requirements before deployment; those requirements can change.
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Give administrators individual accounts and role-specific permissions. Keep privileged identities and credentials within their assigned tier, avoid reusing credentials across tiers, and do not use a Domain Admin-equivalent account for routine work. Membership in Tier 0 does not mean every administrator needs Domain Admin rights. Keep Tier 0 focused on identity control and recovery rather than expanding it to general business applications or infrastructure.
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- Do not share administrative accounts.
- Grant each role the minimum permissions it needs, and review memberships regularly.
- Keep service accounts, agents, automation, and operator roles scoped to one tier where practical.
- Do not let a lower-tier device or administrator become a route to higher-tier credentials or control.
Microsoft’s tier-model guidance states, “No shared credentials across tiers.” Use Microsoft’s developing a privileged access strategy guidance to understand the broader strategy. Microsoft’s current default recommendation has shifted away from treating the older Enhanced Security Admin Environment (ESAE or “red forest”) pattern as the default; existing ESAE environments do not automatically require urgent replacement if they are operated as designed.
Use PAM and PIM for the scope they actually manage
PAM capabilities such as credential vaulting and rotation, approvals, session controls, auditing, and just-in-time elevation can reduce risk and improve accountability. They support the tier model; they do not replace it. Place the PAM components, their administrators, and their stored credentials within the trust tier of the resources they can control.
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| Capability | What it addresses | Scope distinction |
|---|---|---|
| Microsoft Identity Manager PAM | Privileged access workflows for an existing isolated AD environment. | On-premises AD DS context; see Privileged Access Management for Active Directory Domain Services. |
| Microsoft Entra PIM | Management of privileged roles for Microsoft Entra ID and connected cloud services. | Cloud identity scope; it is not interchangeable with Microsoft Identity Manager PAM for an isolated on-premises AD DS environment. See Microsoft Entra privileged roles and permissions; the cited page is marked preview, so check its current status and scope. |
Hybrid organizations should define how on-premises AD DS and cloud roles are governed, including which identities, devices, and systems cross between the two environments. Microsoft’s Enterprise access model expands the older three-tier AD model to account for management, data and workload, user, and application access.
Put the controls into an operating sequence
- Map the environment. Inventory identities, devices, directory services, management systems, and recovery paths. Assign tiers based on effective control and exposure.
- Define administrative roles. Separate accounts by scope, remove unneeded privileges, and identify which tasks genuinely require elevated access.
- Secure each tier’s entry point. Provision and manage dedicated PAWs; ensure every vault, gateway, or jump host in a privileged path has an appropriate trust level.
- Configure PAM workflows. Where useful, require approval or time-limited elevation, protect and rotate credentials, and log privileged activity without placing the tool below the systems it controls.
- Review and monitor. Monitor privileged access, inspect role and group membership, and reassess classifications when systems, integrations, or recovery capabilities change.
CISA and co-authors’ February 2024 advisory, PRC State-Sponsored Actors Compromise U.S. Critical Infrastructure, also corroborates the value of tiering and limiting elevated-access duration. Use current Microsoft documentation for configuration details.
Choose a design by its security boundary and operating burden
When comparing PAM products or architectures, evaluate whether each one fits the environment rather than treating feature lists as proof of protection.
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- Identity scope: Does it cover on-premises AD DS, cloud identity, or both—and where are the boundaries?
- Credential protection: How are privileged credentials isolated, controlled, and rotated?
- Elevation and sessions: Does it support approval, just-in-time access, and appropriate session controls?
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These are decision criteria, not a product ranking. The sources cited here do not establish a product-by-product comparison or current pricing.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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