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Avatar photoRobert Allen

Founder, Owner, and Product Development at Active Directory Pro.

Robert has extensive experience in Windows System Administration, Office 365, Azure, Cisco switches and routers, VMWare, PowerShell, L2, and L3 networking, network security, Cisco ASA, and Fortigate firewalls. Robert Allen holds several IT certificates including, MCSE, MSA, CCNA, CCNA Security, and CompTIA Security +.

Since launching Active Directory Pro, Robert has published several detailed how-to guides and best practices that have become very popular. Active Directory Pro is now one of the most popular resources for information on Active Directory, Microsoft Servers, and related technologies.

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Account lockout event id 4740

September 7, 2024

Account Lockout Event ID: Find the Source of Account Lockouts

When an Active Directory user account is locked, an account lockout event ID is added to the Windows event logs. … Read more

How to add a secondary domain controller

September 10, 2023

How to Add Secondary Domain Controller (2012, 2016, 2019)

Having one Domain Controller is not recommended because it creates a single point of failure. If the only Domain Controller … Read more

get-adgroup powershell examples

November 1, 2023

Get-ADGroup: How To Get All AD Groups with PowerShell

The PowerShell Get-ADGroup cmdlet is used to search Active Directory for single or multiple groups. The Get-ADGroup filter parameter allows … Read more

get adcomputer command

October 19, 2024

Get-ADComputer: How to Get All AD Computers with PowerShell

In this post, I’ll show you several examples of the Get-ADComputer PowerShell command. This command is used to search active … Read more

How to search active directory for ad objects

October 20, 2024

How to Search Objects in Active Directory

In this article, you will learn how to search Active Directory to find objects such as users, computers, OUs, and … Read more

Microsoft 365 groups vs shared mailboxes

November 14, 2022

Microsoft 365 Groups vs Shared Mailbox: What’s the Difference?

In this guide, I will explain the difference between Microsoft 365 Groups and a Shared Mailbox, as well as the … Read more

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