How to fix dcdiag warning for machineaccount test

If you ran the Domain Controller test check using DCDIAG and faced an issue with the MachineAccount test, this post shows the root cause of the problem and how to fix dcdiag warning.

DCDIAG MachineAccount test warning attribute is 0x82020:

The default value for computers objects in Active Directory is:

Domain controller : 0x82000 (532480)

Workstation/server: 0x1000 (4096)

As you can see below, this Domain Controller has the value set as 0x82020:

Why?

This is a bug that happens after a computer object, pre-created in Active Directory Users and Computers (ADUC), is promoted to a Domain Controller.

Resolution

1 – Open the ADSIEdit;

2 – Find the domain controller object with this issue;

3 – Find the attribute userAccountControl and edit it to the value equal 532480

Re-execute the DCDIAG test and make sure the warning is gone, if not, reboot the Domain Controller and repeat the test.

references

DCDIAG (Domain Controller Diagnostics) is a command-line tool used in Windows Server environments to diagnose and troubleshoot domain controllers. It performs a series of tests to ensure the health and functionality of Active Directory. Here are some key DCDIAG tests:

1. Connectivity: Checks network connectivity between domain controllers, ensuring they can communicate effectively.
2. Replication: Verifies that Active Directory replication is functioning correctly between domain controllers, ensuring data consistency across the network.
3. Services: Ensures that critical Active Directory services, such as NTDS (NT Directory Services) and Kerberos, are running properly on each domain controller.
4. Advertising: Checks if the domain controller is correctly advertising its services on the network, allowing clients to locate and use it.
5. FSMOs: Verifies the availability and proper functioning of Flexible Single Master Operation roles, which are crucial for maintaining AD consistency.
6. SystemLog: Examines the System Event Log for any critical errors that might affect AD operations.
7. NetLogons: Checks the NetLogon service status and ensures secure channel functionality between the domain controller and its clients.

Running DCDIAG regularly helps maintain a healthy Active Directory environment by identifying and diagnosing potential issues before they become critical problems. It’s an essential tool for Active Directory administrators in their routine maintenance and troubleshooting processes.

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