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Windows Server 2025 Client fails to register Witness Server in SMB for SQL Cluster

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Category:
ontap-9
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nas
Last Updated:

Applies to

  • ONTAP 9
  • CIFS/SMB
  • SMB Witness
  • SMB for SQL cluster
  • Windows Server 2025

Issue

  • SMB Witness client fails to register Witness server after installing Windows Server 2025
  • Authentication in SMB Witness Server works fine
  • RegisterEx call fails with error Witness Client failed to register with Witness Server for nortification NetName with error (A remote procedure call (RPC) protocol error occurred)
  • Packet trace shows failure for DCERPC opnum 4 (RegisterEx call) with error nca_unspec_reject:  

Frag Length: 304
Auth Length: 16
Call ID: 2
Alloc hint: 236
Context ID: 0
Opnum: 4 


 14    2025-12-03 07:10:38.021061    10.0.0.1    10.0.0.2        WITNESS    59780    40001        RegisterEx requestOperation: RegisterEx (4)
[Response in frame: 15]
Version: WITNESS_V2 (131072)

15    2025-12-03 07:10:38.021094    10.0.0.2    10.0.0.1        DCERPC    40001    59780        Fault: call_id: 2, Fragment: Single, Ctx: 0, status: nca_unspec_reject

  • Client System Manager shows Event ID 8:

EventLog.png

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