Active Directory Certificate Services: AD CS Explanation and Configuration Want tighter control over your Windows Server environment? In this video, we'll explain AD CS, how to configure it and how to troubleshoot common issues. Before we begin, be sure to subscribe to NinjaOne's IT Video Hub for more tech content like this. What is Active Directory Certificate Services or AD CS? Think of AD CS as your network's digital ID system. It issues and manages certificates that encrypt communication and verify identities and ensure data integrity. It's built into Windows Server and provides in-house Public Key Infrastructure (PKI). Creating a secure PKI starts with installing and configuring Active Directory Certificate Services. Before starting, make sure you have a Windows Server OS, Active Directory Domain Services set up, a static IP, admin privileges. To install AD CS on a Windows Server, follow these steps. Click on the Start menu and launch Server Manager. Select Manage and click “Add roles and features.” Choose Role-based or Feature-based installation from the Add Roles and Features wizard. Then click Next. In Server Selection, select your server, then click Next. Scroll down and select Active Directory Certificate Services. Click Add Features, then click Next. Choose the AD CS role services you want to install, then click Next. After reviewing your selections, select “Restart the destination server automatically if required.” Then click Install. Once done, click Close. You can now configure your AD CS. To configure AD CS, make sure that the installation is done and you have clicked Close. Then select the notification flag in Server Manager and find the message to begin post deployment configuration. Click the link to start the configuration. Even if you configure AD CS perfectly, you might encounter some issues. Here are common AD CS issues and how to resolve them. Template errors: Double-check misconfigured templates. CA won't start: Check event logs, permissions, ports. Revocation issues: Ensure CRL or OCSP responders are working. Enrollment failures: Confirm permissions and CA connectivity Expired or revoked certs: Set up alerts and check CRL access. Chain validation: Ensure full certificate chain is trusted. Client-side issues: Sync time, allow network or firewall access. For more information, check out our official blog post on Active Directory Certificate Services (AD CS) explanation and configuration linked in the description below.