On September 9, 2025, Microsoft released KB updates that conflict with Netwrix Threat Prevention (formerly StealthINTERCEPT) agents used by Threat Manager for AD to collect AD event data. If these KBs are applied before updating the agents, certain LDAP and Kerberos events will no longer be captured or blocked.
Netwrix recommends delaying the deployment of these KBs if the impacted event types are important to your organization. The Netwrix development and QA teams are working on updated agents compatible with these KBs and will send another notice when they are available.
Important Details
If your Threat Manager for AD deployment does not use Threat Prevention (formerly StealthINTERCEPT) agents for the following activity event collection, or such events are not deemed important, you may elect to deploy the following Microsoft KBs in advance of updated Netwrix Threat Prevention agents.
No other aspect of Threat Manager operation is impacted by the September 9, 2025 KBs beyond what is described below. There is no adverse impact to domain controllers if the KBs are deployed without updating the agents.
Event Types Affected:
- Server 2025 Termsrv (Jumpbox) blocking
- Server 2022 capture or block Kerberos or NTLM authentication activity
- Server 2019 capture or block NTLM authentication activity
- Server 2016 capture or block Kerberos or NTLM authentication activity, Capture or Block AD Replication activity
Severity: MEDIUM
Affected Products:
- Netwrix Threat Prevention (formerly StealthINTERCEPT) for Active Directory
- Netwrix Threat Manager (formerly StealthDEFEND) for Active Directory
Affected agent Builds - all prior to:
- 7.5.0.234
- 7.4.0.246
- 7.3.9.317
Affected Systems:
- Windows Server 2025
- Windows Server 2022
- Windows Server 2019
- Windows Server 2016
Affected Microsoft KBs:
- KB5065426 (Windows Server 2025)
- KB5065432 (Windows Server 2022)
- KB5065428 (Windows Server 2019)
- KB5065427 (Windows Server 2016)
Impact:
Functional:
- 2025 Server – KB5065426
- Impact: Termsrv (JumpBox) blocking
- Log:
Couldn't resolve CConnectionEx::InitializeClientData (4 param)
- 2022 Server – KB5065432
- Impact: Netwrix Threat Prevention / StealthINTERCEPT agents will lose the ability to capture or block Kerberos or NTLM authentication activity
- Log:
Couldn't resolve KdcGetTicket
Couldn't resolve NlpUserValidate
- 2019 Server – KB5065428
- Impact: Netwrix Threat Prevention / StealthINTERCEPT agents will lose the ability to capture or block NTLM authentication activity
- Log:
Couldn't resolve NlpUserValidate
- 2016 Server – KB5065427
- Impact: Netwrix Threat Prevention / StealthINTERCEPT agents will lose the ability to capture or block Kerberos or NTLM authentication activity and capture or block AD Replication activity
- Log:
Couldn't resolve I_RenewTicket
Couldn't resolve NlpUserValidate
Couldn't resolve IDL_DRSGetNCChanges
Stability:
No stability impact on any server platforms or domain controllers