The DFS Replication service is stopping communication with partner DC3 for replication group Domain System Volume due to an error. The service will retry the connection periodically.

techcoor 1,266 Reputation points
2021-05-17T22:19:35.24+00:00
        Additional Information:              Error: 1723 (The RPC server is too busy to complete this operation.)              Connection ID: 3102F341-A9F9-469F-ACED-D8D4D6B4AF9B              Replication Group ID: 678AF27B-4AC7-459A-84CD-C1C04A6BEB1F          An error event occurred.  EventID: 0xC0001390             Time Generated: 05/12/2021   19:34:07             Event String:             The DFS Replication service failed to communicate with partner DC3 for replication group Domain System Volume. This error can occur if the host is unreachable, or if the DFS Replication service is not running on the server.  

The DFS Replication service is stopping communication with partner DC1 for replication group Domain System Volume due to an error. The service will retry the connection periodically. Additional Information: Error: 9036 (Paused for backup or restore) Connection ID: 92888B85-F6BD-4B62-BEB1-4EA4EA0046DD Replication Group ID: 678AF27B-4AC7-459A-84CD-C1C04A6BEB1F

Windows for business | Windows Client for IT Pros | Directory services | Active Directory
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  1. Anonymous
    2021-05-26T21:45:20.38+00:00

    This one has nothing to do with active directory. This may just be a warning you can safely ignore.
    https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/dfsr-diagnostics-shows-sharing-violations-events

    --please don't forget to Accept as answer if the reply is helpful--

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  1. Anonymous
    2021-05-17T22:23:12.433+00:00

    Not a lot to go on but I'd check that the required ports are flowing between networks.
    https://learn.microsoft.com/en-us/troubleshoot/windows-server/identity/config-firewall-for-ad-domains-and-trusts
    https://www.microsoft.com/en-us/download/details.aspx?id=24009

    --please don't forget to Accept as answer if the reply is helpful--

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  2. Anonymous
    2021-05-18T01:07:21.377+00:00

    Hi,

    Did the errors happen at the specific time?
    Was there a backup processing when the error happened?
    If the error was caused by the backup, you can ignore the error or schedule the replication to stop when the backup processing.
    Following link for your reference:
    https://social.technet.microsoft.com/Forums/en-US/af89b4e2-ad28-4978-8355-3973cc476dfe/dfs-replication-issue-in-secondary-ad?forum=winserverDS

    Best Regards,

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  3. Anonymous
    2021-05-18T01:08:49.513+00:00

    Just checking if there's any progress or updates?

    --please don't forget to Accept as answer if the reply is helpful--

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  4. techcoor 1,266 Reputation points
    2021-05-20T20:06:48.057+00:00

    DSPatrick
    Not a lot to go on but I'd check that the required ports are flowing between networks.
    https://learn.microsoft.com/en-us/troubleshoot/windows-server/identity/config-firewall-for-ad-domains-and-trusts
    https://www.microsoft.com/en-us/download/details.aspx?id=24009
    Not sure what to do with your first link.
    Client Port(s) Server Port Service
    49152 -65535/UDP 123/UDP W32Time
    49152 -65535/TCP 135/TCP RPC Endpoint Mapper
    49152 -65535/TCP 464/TCP/UDP Kerberos password change
    49152 -65535/TCP 49152-65535/TCP RPC for LSA, SAM, NetLogon ()
    49152 -65535/TCP/UDP 389/TCP/UDP LDAP
    49152 -65535/TCP 636/TCP LDAP SSL
    49152 -65535/TCP 3268/TCP LDAP GC
    49152 -65535/TCP 3269/TCP LDAP GC SSL
    53, 49152 -65535/TCP/UDP 53/TCP/UDP DNS
    49152 -65535/TCP 49152 -65535/TCP FRS RPC (
    )
    49152 -65535/TCP/UDP 88/TCP/UDP Kerberos
    49152 -65535/TCP/UDP 445/TCP SMB (**)
    49152 -65535/TCP 49152-65535/TCP DFSR RPC (*)
    I am guessing these ports have to be enabled. I open Windows Defender Firewall.
    I look at inbound rules
    123/UDP enabled
    135/TCP enabled
    464/TCP/UDP enabled
    49152-65535/TCP can not find
    389/TCP/UDP enabled
    636/TCP enabled
    3268/TCP enabled
    3269/TCP enabled
    53/TCP/UDP enabled
    49152 -65535/TCP can not find
    88/TCP/UDP enabled
    445/TCP enabled
    49152-65535/TCP can not find
    Tried portqry -n DC3 -p both -e 49152-65535 but stopped that as it was taking too long for the results.
    123 listening
    135 not listening
    464 listening
    389 listening
    636 TCP listening UDP not listening
    3268 not listening
    3269 TCP listening UDP not listening
    53 listening
    88 TCP listening UDP not listening
    445 TCP listening UDP not listening

    Did the errors happen at the specific time? When I run the program.
    Was there a backup processing when the error happened? Not that I know of. I disabled Retrospect and Windows Server backup and that makes no difference.
    If the error was caused by the backup, you can ignore the error or schedule the replication to stop when the backup processing.
    Following link for your reference:
    https://social.technet.microsoft.com/Forums/en-US/af89b4e2-ad28-4978-8355-3973cc476dfe/dfs-replication-issue-in-secondary-ad?forum=winserverDS

    Maybe DFS is stuck

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