16 guides
Diagnose and fix Active Directory replication error 5 (Access is denied) — from Kerberos and time skew to RPC sealing policy, secure channel, and UDP fragmentation.
Enable the Active Directory Recycle Bin and recover deleted users, groups, and OUs with Restore-ADObject or ADAC. Learn the prerequisites and why enabling is permanent.
Install the DHCP role on Windows Server, authorize it in Active Directory, create a scope, set options, add reservations and exclusions, and configure DHCP failover.
Find locked-out AD accounts fast with Search-ADAccount, trace the lockout source using event ID 4740 on the PDC Emulator, and fix the cause with the right tools.
Pillar Guide
A practical Windows Server hardening checklist for AD environments: patching, disabling SMBv1, RDP/NLA, account lockout, tiering, audit logging, and firewall rules.
Pillar Guide
Migrate Active Directory from Server 2012 R2 to 2022 the safe way: add a 2022 DC, transfer FSMO, raise functional levels, move DNS/DHCP, then demote the old DC.
Work through why a GPO won't apply — gpupdate, gpresult, link and scope, security and WMI filtering, SYSVOL replication, slow links, and loopback — with the commands to prove it.
Force AD replication on demand with repadmin /syncall /AdeP, replicate now in Sites and Services, and verify the result with repadmin /replsummary and /showrepl.
Pillar Guide
Step-by-step guide to installing the AD DS role on Windows Server 2022, promoting the first domain controller, setting functional levels, DNS, and verifying with dcdiag.
Retire an old domain controller without breaking your domain. Pre-checks, moving FSMO/GC/DNS/DHCP roles, graceful demotion, metadata cleanup, and DNS cleanup.
How to configure DNS on domain controllers the right way: partner-first then loopback, AD-integrated zones, forwarders, and how to avoid the DC islanding problem.
Protect your domain with a proper Active Directory system state backup. Learn wbadmin backups, DSRM, authoritative vs non-authoritative restore, and why snapshots aren't enough.
Locked out by BitLocker? Find your recovery key from a Microsoft account, Entra ID, Active Directory, or a printout — and learn why it's asked for after BIOS changes.
SYSVOL or NETLOGON missing on a domain controller? Learn to diagnose DFSR vs FRS, check the shares, and run authoritative or non-authoritative sync to recover.
Pillar Guide
Learn the 5 FSMO roles, when to transfer them gracefully vs seize them after a DC failure, and how to do both with ntdsutil and PowerShell — safely.
Pillar Guide
A practical, step-by-step guide to diagnosing and fixing Active Directory replication error 1722 — the RPC server is unavailable — from DNS to firewall to RPC ports.