17 min readKerberos authentication breaks when domain clocks drift. Diagnose W32Time failures, fix the PDC Emulator time source, resolve Local CMOS Clock, KRB_AP_ERR_SKEW, virtual DC drift, and recover from domain-wide time skew on Windows Server 2025.
15 min readActive directory dns problems cause authentication failures, replication errors, and Group Policy issues — often without looking like DNS. Covers SRV records, Event IDs 4013/4015/5774/5781, domain join failures, scavenging, and Global Catalog DNS on Windows Server 2025.
12 min readWhen active directory replication is not working, broken AD can run silently for hours before authentication or Group Policy failures surface. This guide covers every error code, event ID, and recovery scenario — from Error 1722 and time skew to lingering objects and USN rollback.
10 min readA nine-step active directory post-install checklist for Windows Server 2025. Verify AD DS services, DNS integration, SYSVOL, FSMO roles, time synchronization, replication, Group Policy, and System State backup before deploying users.
13 min readActive Directory Domain Services (AD DS) is Microsoft’s centralized identity, authentication, and Group Policy platform for Windows networks. This guide explains how AD DS works, what domain controllers do, and the deployment decisions that are difficult to reverse.