Windows 11 24H2 Causes ntdll.dll Error (0xc0000409) in SAP GUI (SAPLogon.exe)

Troubleshooting SAP GUI Issues Post-Windows 11 24H2 Update

The recent Windows 11 24H2 update, identified as KB5055523, introduces a range of vexing bugs, particularly affecting SAP GUI. Notably, users have reported that SAP GUI frequently crashes, accompanied by incidents of ntdll.dll errors linked to SAPLogon.exe. Error codes such as 0xc0000409 and 0x000b1c30 have surfaced in the Event Viewer, indicating critical failures.

Identifying the Problem

While awaiting a detailed response from Microsoft, insights from Windows Latest reveal a support document from CrowdStrike that outlines the underlying issues. It appears that there is a conflict between Windows 11 and the CrowdStrike Falcon security application, hindering operations of certain applications, including SAP GUI.

Error Details from Event Viewer

When examining the Event Viewer logs, the following error details are commonly noted:

SAPLogon.exe, Version: 8000.1.7.1161
Faulting Module: ntdll.dll, Version: 10.0.26100.3775
Exception Code: 0xc0000409
Fault Offset: 0x000b1c30
Faulting Application Path: C:\Program Files (x86)\SAP\FrontEnd\SAPgui\saplogon.exe
Location of Faulty Module: C:\WINDOWS\SYSTEM32\ntdll.dll

This information is essential for diagnosing the specific issues you might encounter with SAP GUI post-update.

Understanding the Conflict and Its Causes

According to CrowdStrike’s support documentation, the Additional User-Mode Data (AUMD) feature in the Falcon sensor is a key factor behind these crashes. This feature is designed to safeguard policies within Falcon by preventing unauthorized alterations. However, issues manifest specifically after the installation of Windows 11 KB5055523.

Furthermore, SAP’s internal communication confirms the incompatibility of SAP GUI with the latest Windows 11 update, emphasizing that users may find it entirely non-functional following the update. SAP stated, “After the update of Windows KB5055523, SAP GUI for Windows cannot be used anymore, ” illustrating the severity of the problem.

Resolution Steps for SAPLogon.exe Crashes

To resolve the issues surrounding SAP GUI, you can take the following steps:

Rollback Windows Update: Use Command Prompt or PowerShell to revert to the previous system version. A rollback can immediately alleviate your SAP GUI troubles.
Disable AUMD in Falcon Sensor: If possible, turning off the AUMD feature may restore functionality to SAP GUI.
Await an Official Update: Stay tuned for patches from CrowdStrike, SAP, and Microsoft, as they collaborate to rectify these issues.

It’s crucial to monitor ongoing developments regarding this issue, especially as other bugs have also emerged in the Windows 11 24H2 update; for instance, the Windows Hello feature failing to operate properly.

In light of this update, the infrared camera, essential for Windows Hello, is mistakenly blocked when the standard camera is deactivated. Users should be aware of the multiple faults resulting from this recent update.

Frequently Asked Questions

1. What is the main issue caused by Windows 11 KB5055523 with SAP GUI?

The main issue is that SAP GUI crashes or fails to open due to a conflict between Windows 11 KB5055523 and the CrowdStrike Falcon security application, resulting in ntdll.dll errors related to SAPLogon.exe.

2. How can I fix the crashing issue with SAP GUI after installing the Windows 11 update?

You can fix the issue by rolling back the Windows Update using Command Prompt or PowerShell, disabling the AUMD feature in CrowdStrike Falcon, or waiting for an official update from CrowdStrike, SAP, or Microsoft that addresses the bug.

3. Are there other known bugs with Windows 11 24H2 apart from SAP GUI issues?

Yes, aside from SAP GUI issues, users have reported that the Windows Hello feature ceases to function, particularly when the camera is disabled, due to a bug blocking the infrared camera operations.

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