This notice highlights recent Microsoft KB conflicts that impact Kerberos event capture and blocking on Windows Server 2016, 2019, and 2022.
Want the full details? Click the link below!
On January 13, 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 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.
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 January 13, 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:
Capture 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)
- Windows Server 2019 (for Active Directory)
- Windows Server 2016 (for Active Directory)
Affected Microsoft KBs:
- Windows Server 2025 KB5073379
- Windows Server 2022 KB5073457
- Windows Server 2019 KB5073723
- Windows Server 2016 KB5073696
Impact:
Functional:
- Windows Server 2025 — KB5073379
AD Module will lose the ability to capture Kerberos authentication activity.
Log Indicators:resolving HandleTGSRequest failed
-
Windows Server 2022 — KB5073457
AD Module will lose the ability to capture Kerberos authentication activity.
Log Indicators:resolving HandleTGSRequest failedCouldn't resolve I_RenewTicketCouldn't resolve I_GetASTicket
-
Windows Server 2019 — KB5073723
AD Module will lose the ability to capture Kerberos authentication activity.
Log Indicators:resolving HandleTGSRequest failedCouldn't resolve I_RenewTicketCouldn't resolve I_GetASTicket
-
Windows Server 2016 — KB5073696
AD Module will lose the ability to capture Kerberos authentication activity.
Log Indicators:resolving HandleTGSRequest failedCouldn't resolve I_RenewTicketCouldn't resolve I_GetASTicket
Stability:
No stability impact on any server platforms or domain controllers.
Need help with this update?
There are many different ways to get help with our products!
| Situation | Action |
|---|---|
| If you feel the product is broken and not working as intended… | Contact Support |
| If you have a question you’d like to ask other experts… | Create a discussion in the community: Activity Monitor > Discussions & Questions |
| If you have a feature request… | Let our product team know directly: Activity Monitor > Ideas |
| If you have something cool to show… | Show everyone what you built: Activity Monitor > Show & Tell |
What are your thoughts?
We are always happy to hear from our users on what you like, and what you hope to see in the future. Please, share your thoughts below!