SMB · Troubleshooting “Access Is Denied” Mapping a Drive Over SMB A drive mapping that fails with nothing but “Access is denied” is the network telling you it worked exactly…
Read More “Access Is Denied” Mapping a Drive Over SMB
Windows · Hyper-V Hyper-V Basics Hyper-V is the virtualization role built into Windows Server and Windows itself, and three decisions – VM generation, virtual switch type, and checkpoint type –…
PowerShell · Functions Writing PowerShell Advanced Functions A practical guide to turning a plain PowerShell function into an advanced function that validates its input, behaves correctly in the pipeline, and…
Kerberos · Troubleshooting Kerberos Constrained Delegation Not Working Constrained delegation almost always breaks in the same place — a middle-tier service that is not actually trusted to hand off a…
AI Tools · Choosing by Use Case Choosing the Right AI Tool for the Job A practical breakdown of which AI tool actually fits each job — coding, research, writing,…
Windows · Failover Clustering Failover Clustering Failover Clustering keeps a workload running when a server fails by moving it to another node automatically, and almost every design decision in it…
Windows · Storage Spaces Storage Spaces Storage Spaces turns a pile of ordinary disks into pooled, resilient storage without a hardware RAID controller, and almost every configuration choice – simple,…
Active Directory · Troubleshooting USN Rollback Detected — Event 2095 A domain controller that was rolled back to an old snapshot or restored the wrong way keeps replicating like nothing…
Active Directory · Troubleshooting RID Pool Exhaustion — Cannot Create New AD Objects New users, groups, and computers suddenly fail to create with the same unhelpful directory-service error, and the…
Homelab · Proxmox Installing Proxmox VE: From ISO to First Login A step-by-step walkthrough of turning a spare box into a Proxmox VE host, from downloading the ISO to the…
Windows · DNS Server Windows DNS Server Windows DNS Server is the role that turns names into addresses for an entire network, and because Active Directory refuses to start without…
Windows · Event Logging Event Viewer and the Windows Event Log Architecture Event Viewer is just the window dressing – the actual system underneath is a set of named channels,…
Active Directory · Troubleshooting LDAPS Fails After the Domain Controller Certificate Expires LDAPS binds that worked for months start failing the moment a domain controller’s Server Authentication certificate crosses its…
Windows · Service Management Windows Services A Windows service keeps a piece of software running without anyone signed in to babysit it, and nearly everything that goes wrong with one…
Active Directory · Troubleshooting Stale DNS Records After a Domain Controller Decommission A decommissioned domain controller keeps showing up in DNS — clients still try to reach it, SRV records…
Homelab · Virtualization Proxmox VE Why Proxmox VE has become the default free hypervisor for homelabs and cost-conscious enterprises, and how it stacks up against ESXi, XCP-ng, Hyper-V, and oVirt.…
Active Directory · Troubleshooting DFSR SYSVOL Stuck — Event 4012 and Backlog Not Clearing A growing DFSR backlog or an Event 4012 in the DFS Replication log looks like SYSVOL…
Windows · Task Automation Task Scheduler Task Scheduler runs a program on a schedule or in response to an event instead of someone doing it by hand, and nearly every…
AI Tools · Agent Skills AI Skills: A Beginner’s Guide to Claude and Codex A plain-language walkthrough of what an AI Skill actually is, the exact settings Claude and OpenAI’s…
Windows · Host Firewall Windows Firewall with Advanced Security Windows Firewall with Advanced Security is the host-based packet filter built into every modern Windows client and server, and understanding its…
Active Directory · Troubleshooting Kerberos Clock Skew — KRB_AP_ERR_SKEW KRB_AP_ERR_SKEW means Kerberos has stopped trusting a ticket purely because the clocks on the two machines disagree by more than the…
The trust relationship between this workstation and the primary domain failed - why the machine secure channel breaks and how to fix it without rejoining.
AD replication error 1722 (The RPC Server Is Unavailable): the DNS, port, and firewall causes on the RPC path, diagnosed with repadmin and dcdiag.
No logon servers available to service the logon request - the DNS, DC-reachability, and secure-channel causes, and how to diagnose and fix each.