Troubleshooting Active Directory Certificates with Certutil

Managing certificates in Active Directory can be complex, especially when decommissioned Certificate Authorities leave behind stale or invalid Domain Controller certificates. This text-based course teaches you how to validate, troubleshoot, and clean up domain certificates using the Certutil command-line utility. What you will learn: Understand the core concepts of Active Directory Certificate Services (AD CS) and certificate validation; Master Certutil commands to diagnose PKI issues and verify certificate chains; Learn the exact behavior of the dcinfo deletebad parameter and why certificates sometimes persist; Clean up expired, revoked, or untrusted certificates safely from Active Directory stores; Apply modern security best practices to maintain a healthy, zero-trust-aligned PKI environment. We begin with essential PKI terminology and basic certificate architecture before moving into practical command-line troubleshooting workflows. This course is designed for beginner systems administrators and IT professionals looking to demystify Active Directory certificates with no prior PKI experience required. Start mastering Active Directory certificate troubleshooting today.