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Frequently Asked Questions

What is the dcdiag utility?

The DCDiag utility can be used to diagnose the health of Active Directory domain controllers, DNS servers, AD replication, and other domain services. This utility is built into the modern Windows Server 2019/2016/2012R2 versions (in previous versions of Windows Server, the DCDiag utility must be installed manually from the Support Tools package).

How do I access dcdiag?

Any machine that has the AD DS role active will have DCDiag already. By default, you can access DCDiag through the command line on your individual Domain Controllers. You can also access DCDiag by installing the Remote Server Administration Tools (RSAT) on a workstation or enabling it on Windows Server 2008 R2 through Server 2016 server.

What does failed mean in dcdiag?

If an error is found, the Failed message will appear next to the check name. DcDiag allows you to perform a quick general health test of Active Directory and domain controllers. To check all DCs in the domain, use the /e parameter. The following command will only list errors that require the AD administrator’s attention:

What is the naming context in dcdiag?

Uses NamingContext as the naming context to test. You can specify domains in NetBIOS, Domain Name System (DNS), or distinguished name format. Uses Domain \ UserName. Dcdiag uses the current credentials of the user (or process) that is logged on.


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