Overview: Promoting a Server to Domain Controller Adding a second (or additional) domain controller to an existing Active Directory domain is one of the most critical operations an administrator performs. A single-DC environment is a single point of failure — if that DC goes down, authentication, Group Policy application, DNS resolution, and file access all […]
PAM (Pluggable Authentication Modules) is the framework that sits between Linux applications and the underlying authentication mechanisms. Almost every program that authenticates users on RHEL 9 — SSH, su, sudo, login, and graphical sessions — goes through PAM. By configuring PAM you can enforce password complexity requirements, lock accounts after failed login attempts, set resource […]
Understanding Active Directory Sites and Services Active Directory Sites and Services is a Microsoft Management Console (MMC) snap-in and a core component of Active Directory that controls how directory replication occurs across a distributed network. An AD site is a logical representation of a physical network location — typically corresponding to a geographical location, a […]
Introduction to Domain Joining Windows and Linux Machines Active Directory Domain Services (AD DS) on Windows Server 2022 serves as the central identity and access management platform for enterprise environments. Joining both Windows and Linux machines to an AD domain enables single sign-on, centralized authentication, Group Policy enforcement, and unified user management across heterogeneous infrastructure. […]
Understanding PKI and Why It Matters Public Key Infrastructure (PKI) is the combination of hardware, software, policies, and procedures required to create, manage, distribute, use, store, and revoke digital certificates. Certificates are used throughout modern Windows environments for TLS/HTTPS encryption, code signing, email signing and encryption (S/MIME), smart card logon, IPsec, Wi-Fi (802.1X), and many […]
🟠 High ⏱ 5–30 min Last verified: 3 March 2023 Affected versions: Windows Server 2016 📖 ~2 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution — Primary Fix Solution — Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]
Why Audit Active Directory Changes Active Directory is the central trust authority for most Windows enterprise environments. Every privilege escalation, account takeover, lateral movement attempt, and persistence mechanism an attacker deploys will leave footprints in AD — if auditing is configured correctly. Without comprehensive AD change auditing, security teams are blind to account creation, group […]
Introduction to the Active Directory Recycle Bin Accidentally deleted Active Directory objects—users, groups, computers, and OUs—have historically been a serious administrative headache. Before Windows Server 2008 R2, recovering a deleted object required either restoring from backup or performing an authoritative restore of Active Directory, both of which are time-consuming operations that can impact production services. […]
🟠 High ⏱ 5–30 min Last verified: 17 February 2023 Affected versions: Windows Server 2012 R2 📖 ~2 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution — Primary Fix Solution — Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related […]
Advanced Audit Policy vs Basic Audit Policy Windows provides two mechanisms for configuring Security event log auditing: the legacy Basic Audit Policy and the more granular Advanced Audit Policy Configuration. Understanding the difference is important before you begin configuring auditing on Windows Server 2022, because the two systems interact in ways that can produce unexpected […]
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