w32tm in Windows: diagnose and fix domain time synchronisation
w32tm is the command line front end to the Windows Time service. It reports where a machine gets its time, how far…
Domain controllers
repadmin in Windows: check, read and force Active Directory replication
repadmin is the tool that answers one question no GUI answers quickly: is every domain controller in this forest actually receiving the…
dsquery and dsget in Windows: command-line Active Directory queries
You need to find every disabled user account in the Sales OU, and you are logged on to a Server Core box…
DCDiag: how to diagnose and fix Active Directory problems
When Active Directory starts behaving unexpectedly - users cannot log in, Group Policy stops applying, replication falls behind, or DNS resolution breaks…
How to fix "trust relationship between this workstation and the primary domain failed"
Introduction The error “The trust relationship between this workstation and the primary domain failed” is one of the most common issues administrators…
nltest command in Windows: domain controller discovery and trust diagnostics
nltest is a command-line utility that communicates directly with the Netlogon service on Windows. It gives system administrators direct access to domain…