Domain controllers don't fail gracefully. Leave interactive logon open to more than Domain Admins, skip the krbtgt rotation schedule, or let unconstrained Kerberos delegation sit on a service account, and you're not looking at a config change. You're looking at a full credential reset across the domain, or an incident response engagement to find out how far an attacker already got. A domain controller compromise doesn't stay contained to one server, and the settings that prevent it get harder to retrofit once production workloads depend on the domain daily.
This checklist gives you a practical, technical framework for hardening Active Directory domain controllers and proving that hardening holds up over time. Thirty-one controls across eight sections, with the reasoning behind each one so you know what breaks if you skip it.
What you'll learn
- How to restrict domain controller access and administration so credentials never touch a lower-tier workstation
- Why Group Policy is where baseline security settings either reach every domain controller or quietly don't
- How to inventory and monitor privileged accounts so an initial foothold can't turn into Domain Admin
- What it takes to protect SYSVOL, GPOs, and file integrity from a single edit that pushes to your whole environment
- How to centralize auditing and logging so local logs aren't the first thing an attacker deletes
- Why change control has to separate planned patching from unplanned drift before you can tell them apart
- How to patch and scan on a cadence that doesn't leave known vulnerabilities running on production domain controllers
- How to prove compliance and resilience with recurring evidence and a tested recovery path, not a one-time audit
Harden before go-live, verify Group Policy actually enforces it, and when an auditor asks for evidence, you'll have a scheduled export instead of a scramble.
If you're responsible for Active Directory domain controllers, this gives you the technical starting point most teams skip.
Share on