Would you like to learn how to configure a group policy to audit the LDAP queries to Active Directory? In this tutorial, we will show you how to configure the monitoring of LDAP queries on the domain controllers using a GPO.

• Windows 2012 R2
• Windows 2016
• Windows 2019
• Windows 2022
• Windows 10
• Windows 11

Equipment list

Here you can find the list of equipment used to create this tutorial.

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Tutorial GPO – Monitor LDAP queries on Active Directory

On the domain controller, open the group policy management tool.

Windows - Group Policy management

Create a new group policy.

Windows 2012 - Group Policy Objects

Enter a name for the new group policy.

Windows - Add GPO

In our example, the new GPO was named: MY-GPO.

On the Group Policy Management screen, expand the folder named Group Policy Objects.

Right-click your new Group Policy Object and select the Edit option.

Windows - Edit GPO

On the group policy editor screen, expand the Computer configuration folder and locate the following item.

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Right-click on the Registry option and create a Registry entry.

GPO - Add registry item

On the registry screen, perform the following configuration.

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Click on the OK button.

GPO - Monitor LDAP on Active Directory

Create the second required registry entry.

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Click on the OK button.

GPO - Expensive Search Results Threshold

Create the third registry entry.

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Click on the OK button.

GPO - Inefficient Search Results Threshold

Create the forth registry entry.

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Click on the OK button.

GPO - Search Time Threshold

Here is the configuration summary.

GPO - Audit LDAP events

To save the group policy configuration, you need to close the Group Policy editor.

Congratulations! You have finished the GPO creation.

Tutorial GPO – Monitor LDAP queries on Active Directory

On the Group policy management screen, link the GPO to the Domain controllers Organizational Unit.

GPO - Link to domain controllers

In our example, we linked the group policy named MY-GPO to the domain controllers.

GPO- tutorial linking

After applying the GPO you need to wait for 10 or 20 minutes.

During this time the GPO will be replicated to other domain controllers.

On a domain controller, start an elevated Powershell command line.

Windows 10 - powershell elevated

List events related to LDAP queries.

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Here is the command output.

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Get details from LDAP events.

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Here is the command output.

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Search for specific LDAP events.

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In our example, we enabled the audit of LDAP events using a GPO.