AD Domain ServicesReplication, Sites & Domain Controllers

Managing AD metadata cleanup post-DC decommission: A Playbook

September 9, 2025
Active Directory behaves as if that DC never existed. This guide goes beyond “delete in ADUC” and covers DNS SRV/CNAME integrity, KCC recomputation, lingering objects, and RODC specifics. Focus: metadata cleanup Covers: ADUC/ADSS/ntdsutil Also: DNS SRV, KCC, DFSR, RODC Quick nav Why this matters now Definition & blind spots Under the hood Production-ready Runbook Inherent…
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AD Domain ServicesArchitecture & Design

SID filtering in complex AD layouts: the one-bit boundary that decides what crosses your forest

September 9, 2025
Quick definition: SID filtering is a trust-side control that removes foreign SIDs—including values in SIDHistory—from a user’s authorization data as it traverses a trust. It prevents privilege escalation by honoring only the SIDs the trusting side expects. Answer box (at a glance) External/domain trusts: Quarantine=Yes by default → accept only SIDs from the directly trusted…
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AD Domain ServicesArchitecture & Design

Indexing mechanisms that make Active Directory searches fly (and when not to use them)

September 5, 2025
If “search is slow” keeps popping up, the root cause is usually query shape and whether the directory can answer it with an index. In Active Directory, the right index can cut a search from seconds to milliseconds—but the wrong one just bloats NTDS.dit. Internal links throughout point to Windows-Active-Directory.com references (WAD), and external links go to Microsoft’s first-source…
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AD Domain ServicesArchitecture & Design

Active Directory 25-year evolution: what changed, what stayed true, and what comes next

September 5, 2025
Comparative guide AD modernization Hybrid identity Zero trust Kerberos Forest recovery Classic AD → Modernized AD → Hybrid future From castle-and-moat to zero trust and hybrid identity: the AD journey. Quick jump: definition · core mechanisms · classic vs modernized · modernization runbook · implications · mental models · misunderstandings & fixes · forward look · field…
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AD Domain ServicesArchitecture & Design

Virtualized AD DS time sync: VMIC vs AD — Definitive somparison

September 5, 2025
Time is the quiet dependency that keeps Active Directory honest. Kerberos tickets rely on it. Replication relies on it. Auditing and security controls rely on it. Virtualization adds the hypervisor’s clock to the mix, creating a strategic choice: should virtualized domain controllers follow the hypervisor (VMIC/VM tools), or the Active Directory hierarchy? Definition: Virtualized AD DS time…
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AD Domain ServicesArchitecture & Design

Virtualized AD DS Time Sync: A hands-on implementation playbook (VMIC vs AD)

September 5, 2025
If you run domain controllers as VMs, time is a design decision—not a default. This Virtualized AD DS time sync playbook gives you a clean, production-ready path to make the AD hierarchy your single authority, avoid conflicts with VMIC/VM Tools, and automate a safe boot/restore hand-off. Active Directory/Virtualization/Time Sync On this page Definition Goals & Guardrails Implementation…
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