If you'd like, I can help you or provide a PowerShell script to automate health checks across all your Domain Controllers. Just let me know!
dcdiag /test:dns DNS is the #1 cause of AD failure; run this first. microsoft dcdiag download
Run PowerShell as Administrator and paste this command: Add-WindowsCapability -Online -Name Rsat.ActiveDirectory.DS-LDS.Tools~~~~0.0.1.0 For Windows Server On a Server OS, the tool is likely already there. If not: Open . Click Add Roles and Features . Skip to Features . If you'd like, I can help you or
Once installed, open a Command Prompt (Admin) and try these common diagnostic checks: Run PowerShell as Administrator and paste this command:
Search for . Click Install . Using PowerShell (Fastest Method)
You must have local administrator privileges to add RSAT features.
Modern Windows versions treat Dcdiag as a feature-on-demand. You install it through Windows settings or PowerShell rather than downloading an .exe file from a website. For Windows 10 and Windows 11 Open . Go to Apps > Optional Features . Click Add a feature (or "View features").