Key takeaway
Inventory privileged accounts and critical objects first. Use separate accounts and protected workstations for administration, monitor changes, and test recovery.
Control privileged access
Limit membership in Domain Admins and other privileged groups to people whose duties require it. Give administrators separate accounts and keep email and web browsing out of privileged sessions. Where temporary elevation is available, require approval, set an expiry and log the activity. Remove unused accounts and permissions after confirming ownership.
Protect admin workstations and sign-ins
Connect to domain controllers and other critical systems only from dedicated, patched and restricted administrative workstations. Require strong MFA on supported administrative and remote-access paths; select the method for the actual AD DS and hybrid architecture. Verify FIDO2 or certificate support for the specific sign-in path; do not weaken Entra Kerberos restrictions for privileged accounts to make a method work. Restrict interactive sign-in for service accounts, keep secrets out of code, and review passwords, keys, gMSAs and SPNs regularly.
Monitor directory changes and test recovery
Centralize logs for group membership, privilege assignments, GPOs, replication and domain-controller configuration changes. Define coverage, retention, an alert owner and a process for investigating unexpected changes. Object restore and forest recovery require different procedures; define the exercise scope accordingly.
Define recovery scope
Identify the object, domain or forest target and its DNS, credential and application dependencies.
Take protected backups
Choose a supported method; align the schedule and backup validity with the environment’s retention and object lifetimes. Protect copies separately.
Exercise isolated recovery
Test the chosen domain or forest recovery away from production, including recovery credentials and DNS dependencies.
Record results
Document recovery results, missing dependencies and owners; repair gaps and repeat the affected exercise.
Keep the directory clean and hardened
Review inactive user and computer accounts with their owners and business need; when appropriate, disable access first and remove them through an approved process. Inventory legacy protocols, weak settings and unnecessary services. Test compatibility before disabling them because applications and older systems may depend on them. Apply Microsoft guidance for your Windows Server version through change testing.
Understand directory objects and trust boundaries
Active Directory Domain Services stores user and computer accounts, groups, organizational units and GPOs; domain controllers provide authentication and directory services. A mistaken group membership or delegation can therefore affect many applications. Document ownership of cross-domain trusts, DNS, replication, service accounts and delegated administration. Validate updates and configuration changes in a test domain first.