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On May 12th, 2026, 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 and NTLM authentication 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.
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 May 12th, 2026 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:
- Server 2025 Capture or block Kerberos and NTLM Authentication activity
- Server 2022 Capture or block Kerberos Authentication activity
Severity:
MEDIUM
Affected Product: Netwrix Activity Monitor for Active Directory
Affected Systems:
- Windows Server 2025 (for Active Directory)
- Windows Server 2022 (for Active Directory)
Affected Microsoft KBs:
- Windows Server 2025 KB5087539
- Windows Server 2022 KB5087545
Impact:
Functional:
- 2025 Server - KB5087539
- Netwrix Activity Monitor AD Module will lose the ability to capture Kerberos authentication activity and NTLM authentication activity
- Log: resolving HandleTGSRequest failed
- Log: Couldn’t resolve NlpUserValidate
- 2022 Server - KB5087545
- Netwrix Activity Monitor AD Module will lose the ability to capture Kerberos authentication activity
- Log: Couldn’t resolve I_GetASTicket
Stability:
No stability impact on any server platforms or domain controllers
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