use the DCDiag tool to check a domain controller

You should regularly check a domain controller (DC), to ensure that it is properly working and syncing all its configuration with other DC’s, one way of completing this task is by using the dcdiag.exe command-line tool.

There are 27 basic tests, including checking registration of DNS records, name resolution, AD replication, and Flexible Single Master Operations (FSMO) roles. If your DC fails any of the tests, it likely indicates a problem. To run the tool locally on a Windows Server DC, open an elevated PowerShell prompt, type dcdiag, and press ENTER.

Windows PowerShell
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PS H:\> dcdiag.exe

Directory Server Diagnosis

Performing initial setup:
   Trying to find home server…
   Home Server = DC1
   * Identified AD Forest.
   Done gathering initial info.

Doing initial required tests

   Testing server: PlexUK\DC1
      Starting test: Connectivity
         ……………………. DC1 passed test Connectivity

Doing primary tests

   Testing server: PlexUK\DC1
      Starting test: Advertising
         ……………………. DC1 passed test Advertising
      Starting test: FrsEvent
         ……………………. DC1 passed test FrsEvent
      Starting test: DFSREvent
         ……………………. DC1 passed test DFSREvent
      Starting test: SysVolCheck
         ……………………. DC1 passed test SysVolCheck
      Starting test: KccEvent
         ……………………. DC1 passed test KccEvent
      Starting test: KnowsOfRoleHolders
         ……………………. DC1 passed test KnowsOfRoleHolders
      Starting test: MachineAccount
         ……………………. DC1 passed test MachineAccount
      Starting test: NCSecDesc
         ……………………. DC1 passed test NCSecDesc
      Starting test: NetLogons
         ……………………. DC1 passed test NetLogons
      Starting test: ObjectsReplicated
         ……………………. DC1 passed test ObjectsReplicated
      Starting test: Replications
         ……………………. DC1 passed test Replications
      Starting test: RidManager
         ……………………. DC1 passed test RidManager
      Starting test: Services
         ……………………. DC1 passed test Services
      Starting test: SystemLog
         ……………………. DC1 passed test SystemLog
      Starting test: VerifyReferences
         ……………………. DC1 passed test VerifyReferences

   Running partition tests on : DomainDnsZones
      Starting test: CheckSDRefDom
         ……………………. DomainDnsZones passed test CheckSDRefDom
      Starting test: CrossRefValidation
         ……………………. DomainDnsZones passed test CrossRefValidation

   Running partition tests on : ForestDnsZones
      Starting test: CheckSDRefDom
         ……………………. ForestDnsZones passed test CheckSDRefDom
      Starting test: CrossRefValidation
         ……………………. ForestDnsZones passed test CrossRefValidation

   Running partition tests on : Schema
      Starting test: CheckSDRefDom
         ……………………. Schema passed test CheckSDRefDom
      Starting test: CrossRefValidation
         ……………………. Schema passed test CrossRefValidation

   Running partition tests on : Configuration
      Starting test: CheckSDRefDom
         ……………………. Configuration passed test CheckSDRefDom
      Starting test: CrossRefValidation
         ……………………. Configuration passed test CrossRefValidation

   Running partition tests on : PlexUK
      Starting test: CheckSDRefDom
         ……………………. PlexUK passed test CheckSDRefDom
      Starting test: CrossRefValidation
         ……………………. PlexUK passed test CrossRefValidation

   Running enterprise tests on : PlexUK.co.uk
      Starting test: LocatorCheck
         ……………………. PlexUK.co.uk passed test LocatorCheck
      Starting test: Intersite
         ……………………. PlexUK.co.uk passed test Intersite
PS H:\>