Microsoft KB Update (October 14, 2025) – Medium Severity

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announcement-2025-10-14T00-28-05-835Z
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On October 14, 2025, Microsoft released KB updates that conflict with the Active Directory (AD) Module in the Netwrix Activity Monitor product.
If these KBs are applied before updating the AD Module, certain Kerberos authentication activity events will no longer be captured.

Netwrix recommends delaying deployment of these KBs if your organization relies on these event types. The Netwrix development and QA teams are working on an updated AD Module compatible with these KBs and will send another notice when it is available.

:double_exclamation_mark: Important Details
If your organization does not use Netwrix Activity Monitor for the following Active Directory activity event collection, or such events are not deemed important, you may elect to deploy the following Microsoft KBs in advance of the updated AD Module.

No other aspect of Activity Monitor operation is impacted by the October 14, 2025 KBs beyond what is described below. There is no adverse impact to domain controllers if the KBs are deployed without updating the AD Module.

Event Types Affected:
Kerberos authentication activity

Severity:
Medium

Affected Product: Netwrix Activity Monitor for Active Directory

Affected Systems:

  • Windows Server 2022 (for Active Directory)
  • Windows Server 2019 (for Active Directory)

Affected Microsoft KBs:

  • Windows Server 2022 KB5066782
  • Windows Server 2019 KB5066586

Impact:

Functional:

  • 2022 Server – KB5066782
    • AD Module will lose the ability to capture Kerberos authentication activity
    • Log:
      • Couldn’t resolve KdcGetTicket
      • Couldn’t resolve KdcVerifyKdcRequest
      • Couldn’t resolve HandleTGSRequest
      • Couldn’t resolve I_GetASTicket
  • 2019 Server – KB5066586
    • AD Module will lose the ability to capture Kerberos authentication activity
    • Log:
      • Couldn’t resolve KdcGetTicket
      • Couldn’t resolve KdcVerifyKdcRequest
      • Couldn’t resolve HandleTGSRequest
      • Couldn’t resolve I_GetASTicket

Stability:
No stability impact on any server platforms or domain controllers