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‎DC windows servers not synced properly to each other‎

Tejdeep Singh 0 Reputation points
2025-02-11T10:07:24.15+00:00

DC windows servers not synced properly to each other . There are 2 windows servers .

  1. INDC-1 (OS - windows server 2012 R2 )
  2. INDC-2 (OS - Microsoft windows server 2016 standard )

Issue is when INDC-1 was down on 6-Feb-2025 . then most of the things working on INDC-1 got down though INDC-2 was UP . please share the root cause of it .

NOTE - I tried to create one contact right now in active directory on INDC-2 and it is reflecting on INDC-1 too . but when INDC-1 was down . it is not shifting all the things on INDC-2 .

Windows
Windows
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Windows Server 2016
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A Microsoft server operating system that supports enterprise-level management updated to data storage.
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Windows Server 2012
Windows Server 2012
A Microsoft server operating system that supports enterprise-level management, data storage, applications, and communications.
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  1. Daisy Zhou 29,471 Reputation points Microsoft Vendor
    2025-02-12T08:07:16.42+00:00

    Hello

    Thank you for posting in Q&A forum.

    Here are some possible causes and steps to troubleshoot:

    1. Ensure that Active Directory replication is functioning correctly between INDC-1 and INDC-2. You can use tools like repadmin to check the replication status and identify any errors.
    2. Verify which DC holds the Flexible Single Master Operations (FSMO) roles. If INDC-1 holds critical FSMO roles (like the PDC Emulator), its downtime could impact the entire domain's functionality.
    3. Ensure that both DCs are correctly configured as DNS servers and that clients are using both DCs for DNS resolution. Misconfigured DNS can lead to clients being unable to locate the available DC.
    4. Check that both DCs are synchronized with the same time source. Time discrepancies can cause authentication issues and replication failures.
    5. Ensure there are no network issues between the two DCs. Network problems can prevent proper replication and communication between the servers.
    6. Review the event logs on both DCs for any errors or warnings related to Active Directory, DNS, or network issues. These logs can provide valuable insights into what went wrong when INDC-1 was down.

    References:

    Windows Server Update Services best practices

    Synchronize directory service data | Microsoft Learn

    I hope the information above is helpful.

    If you have any questions or concerns, please feel free to let us know.

    Best Regards,

    Daisy Zhou

    ============================================

    If the Answer is helpful, please click "Accept Answer" and upvote it.

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  2. Adam J. Marshall 9,686 Reputation points MVP
    2025-02-12T20:34:58.02+00:00
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