Windows Server: April 2024 updates causes NTLM traffic issues

Windows[German]Another addendum from the April 2024 patchday. The updates cause problems with NTLM connections to Windows Server. In any case, Microsoft has received corresponding user reports and is investigating the incident, as the company announced on April 30, 2024.


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I also became aware via the patchmanagement.org list that there is a problem with the April 2024 updates. Microsoft has published the entry NTLM traffic issue after installing the April 2024 security update.

It states that administrators may notice a significant increase in NTLM authentication traffic on domain controllers (DCs) after installing the April 2024 security update (KB5036909).

According to Microsoft, this issue is likely to affect organizations that have a very small percentage of primary domain controllers in their environment and high NTLM traffic. The following Windows versions are affected:

Microsoft is working on a solution and wants to provide an update in one of the next versions.


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