Introduction to LDAP Security LDAP (Lightweight Directory Access Protocol) is the protocol that applications use to query and modify Active Directory. By default, Windows Server 2019 domain controllers accept LDAP connections on port 389 without requiring signing or channel binding, making them vulnerable to man-in-the-middle attacks where an attacker can intercept and relay LDAP authentication. […]
Introduction to Certificate Auto-Enrollment Manual certificate distribution in a large Active Directory environment is impractical and error-prone. Certificate auto-enrollment automates the process of requesting, issuing, and renewing certificates for users and computers based on Group Policy. When configured, domain members automatically receive certificates from your internal Certificate Authority (CA) without any user interaction. This is […]
Introduction to Active Directory Trust Relationships Active Directory trust relationships allow users in one domain or forest to access resources in another domain or forest. Trusts are directional—a trust between Domain A and Domain B means users in Domain A can authenticate to Domain B (or vice versa, depending on direction). Windows Server 2019 supports […]
Introduction to Read-Only Domain Controllers A Read-Only Domain Controller (RODC) is a domain controller that hosts a read-only copy of the Active Directory database. RODCs were designed specifically for branch office scenarios where physical security cannot be guaranteed. If an RODC is stolen or compromised, the damage is limited because it holds no writable copy […]
Introduction to Active Directory Replication Active Directory is a distributed database. In a multi-domain-controller environment, changes made on one DC must propagate to all other DCs in the domain. This process is called replication. Windows Server 2019 uses two replication topologies: intrasite replication (within a site, using RPCs over TCP/IP, triggered within seconds) and intersite […]
Introduction to Active Directory Backup and Recovery Active Directory is the identity foundation of your Windows environment. Domain controllers store the AD database (NTDS.DIT), SYSVOL folder, and the Registry System State. A comprehensive backup and recovery strategy must account for all three components. Windows Server 2019 includes Windows Server Backup (wbadmin) as a built-in tool […]
Introduction to Active Directory Auditing Active Directory is the authentication and authorization backbone of most Windows enterprise environments. Any changes to AD objects—user creations, group membership changes, permission modifications, login failures—can indicate insider threats, compromised accounts, or misconfigurations. Windows Server 2019 provides granular auditing capabilities through Advanced Audit Policy that let you capture exactly what […]
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. […]
Introduction to Fine-Grained Password Policies The Default Domain Password Policy in Active Directory applies uniformly to every user account in the domain. While this simplicity is convenient, it creates a security problem: a helpdesk technician and a Domain Administrator are held to the same password standard. Fine-Grained Password Policies (FGPPs), introduced in Windows Server 2008 […]
Introduction to Active Directory Password Policy Enforcing a strong password policy is one of the most fundamental security controls in any Active Directory environment. Windows Server 2019 provides a Default Domain Password Policy applied through Group Policy, which governs all accounts in the domain unless overridden by Fine-Grained Password Policies. This tutorial walks through configuring […]
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