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Sergio_Raposo's avatar
Sergio_Raposo
Copper Contributor
Jul 30, 2023

Problem changing PDC

Hello, I have an environment with 3 DC's where I want to remove 1 DC. I manage to transfer all roles but whenever I disconnect the DC I want to remove I lose access to the AD and authentication star...
Active Directory
Windows Server
Dave Patrick's avatar
Dave Patrick
MVP
Jul 30, 2023

Might check the results    

netdom query fsmo
Sergio_Raposo's avatar
Sergio_Raposo
Copper Contributor
Aug 05, 2023

Dave Patrick I already did that and the roles are in the DC's to where i moved them and it seams that everything is alright. But every time i query the domain (ping -a <domain>) the IP that i receive is from the DC that i want the remove and when I use netdom query fsmo it point the PDC is the new server. Another thing is that when the roles are in the new server's if i shutdown the DC I want to remove i lost the Active Directory. To regain access again i have to start the old DC. I have done transfer the role without problem, i have seized the role but nothing worked.

  • Dave Patrick's avatar
    Dave Patrick
    MVP
    Aug 05, 2023
    if i shutdown the DC I want to remove i lost the Active Directory. 

    How are you verifying this? Might also check the DHCP server hands out the addresses of healthy domain controllers.     

       

     

    • Sergio_Raposo's avatar
      Sergio_Raposo
      Copper Contributor
      Aug 06, 2023
      Hello,

      I don't have DHCP in the DC's. All the VM's are in Azure and the have fixed IP and DNS server are configured in the network configuration. To identifiy which DC'a have the PDC i run Get-ADDomainController -domainname edoc.local -Discover -Service PrimaryDC and nltest /dsgetdc:edoc.local. When the role is hosted by the DC that i want to remove works fine. When i change the PDC role to another DC i start to get this error:
      Get-ADDomainController : The specified domain either does not exist or could not be contacted
      At line:1 char:1
      + Get-ADDomainController -domainname edoc.local -Discover -Service Prim ...
      + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo : ObjectNotFound: (:) [Get-ADDomainController], ADException
      + FullyQualifiedErrorId : GetADDomainController:BeginProcessingOverride:DiscoverDC:1355,Microsoft.ActiveDirectory.Management.Commands.GetADDomainController

      • Dave Patrick's avatar
        Dave Patrick
        MVP
        Aug 06, 2023

        Please run;

        Dcdiag /v /c /d /e /s:%computername% >C:\dcdiag.log (run on PDC emulator)
        repadmin /showrepl >C:\repl.txt (run on **any** domain controller)
        ipconfig /all > C:\%computername%.txt (run on **EVERY** domain controller)
        ipconfig /all > C:\problemworkstation.txt (run on problem pc)


        Also check the domain controller System and Replication (DFS or FRS) event logs for errors since last boot. Post the ***Event Source*** and ***Event IDs*** of any found. (no evtx files)

        then put `unzipped` text files up on OneDrive and share a link.  

          

         

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