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Datacenter networking servers

Active Directory Replication: A Guide for IT Pros

Learn all there is to know about how Active Directory (AD) replication works. This guide covers the basics of how domain controllers (DCs) replicate all of your user accounts, passwords, computers, and other objects in your environment. Learn about how sites define the logical layout of your network and how the tools and features in...

Last Update: Mar 13, 2024

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Datacenter networking servers

Best Practices for Installing Active Directory Domain Controllers in a Virtual Machine

Last Update: Feb 01, 2024

Installing Active Directory domain controllers in a virtual machine (VM) can be useful if you want to separate them from the physical network, giving you more flexibility and additional protection for your Active Directory infrastructure. In this guide, we’re going to detail the best practices for installing Active Directory domain controllers (DCs) in a virtual…

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Microsoft Releases Fix for Kerberos Authentication Issues on Domain Controllers

Microsoft has started rolling out an out-of-band update to address a bug that was previously causing Kerberos authentication issues on Windows domain controllers (DCs). Microsoft has recently confirmed the problem on the Windows release health dashboard following the release of the November Patch Tuesday updates last week. According to Microsoft, the issue leads to failures…

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Cloud Computing

How to Add a New Domain Controller to an Existing Domain

As an IT Pro, it is highly likely that you’ve needed to add additional domain controllers (DCs) to your Active Directory environment. In this guide, we’ll demonstrate how to add a domain controller to an existing domain. We’ll also detail how to add a new domain controller to create a child domain in your existing…

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What is a Domain Controller?

Last Update: Sep 12, 2022

Domain controllers (DCs) are at the heart of Active Directory Domain Services (AD DS), the directory service that provides authentication, authorization, and password management for Microsoft Windows networks. Find out here why they’re so important and what they do. What does a domain controller do? A domain controller (DC) is a server on your network that manages access for users, computers, servers, etc. centrally. It uses…

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Windows Server 1 Hero Approved

CISA Advises Federal Agencies to Patch Windows LSA Flaw Affecting Domain Controllers

Back in May, the Cybersecurity & Infrastructure Security Agency (CISA) temporarily removed a Windows flaw from its Known Exploited Vulnerability (KEV) Catalog due to Active Directory (AD) certificate authentication issues. CISA has now re-added the security vulnerability to KEV, and it’s encouraging IT admins to patch it by deploying the June Patch Tuesday updates by…

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Windows Server 4 Hero Approved

Microsoft Releases Out-Of-Band Patches to Fix Windows AD Authentication Issues

Microsoft released new out-of-band (OOB) updates yesterday to address Active Directory (AD) authentication problems caused by the May 2022 Patch Tuesday updates. These emergency patches also include a fix for the bug that previously prevented the installation of apps from the Microsoft Store. The May 2022 security updates that shipped earlier this month included fixes…

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Windows Server 1 Hero Approved

Microsoft Confirms May 2022 Patch Tuesday Updates Cause AD Authentication Issues

Microsoft has acknowledged a new issue that causes authentication failures on the server or client machines for some Windows services. The company has confirmed on the Windows Health Dashboard that it’s actively investigating the bug, and a permanent fix would be available in the upcoming release. The first bug reports started to surface earlier this…

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Datacenter networking servers

Microsoft Issues New Guidance on Securing Domain Controllers

Microsoft has released updated guidance to help enterprise customers protect domain controllers (DCs) against cyber attacks. The company urges IT admins to deploy Azure Active Directory (AAD) in their organizations to prevent security breaches. For those unfamiliar, a domain controller is a type of server that responds to security authentication requests from network endpoints (such…

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Microsoft Advises Customers to Patch Active Directory Privilege Escalation Vulnerability

Last month, Microsoft released the November Patch Tuesday updates to address two Active Directory (AD) Domain Services privilege escalation security flaws affecting all supported versions of Windows Server. But it looks like some customers have not updated their servers yet. The company published a blog post yesterday advising customers to install the emergency fixes on…

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