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Microsoft Confirms Recent Windows 11 24H2/25H2 and Server 2025 Update Breaks RemoteApp Connections

## Windows Update Impact on RemoteApp Connections

RBy Robert LangleyDec 18, 20251 min read

Windows Update Impact on RemoteApp Connections

Microsoft has identified an issue with its November 2025 non-security preview update KB5070311, affecting OS builds 26200.7309 and 26100.7309. This update, along with subsequent patches, is causing RemoteApp connection failures within Azure Virtual Desktop (AVD) environments.

The issue impacts enterprise users operating Windows 11 versions 24H2 and 25H2, and Windows Server 2025. It does not affect all desktop sessions, but specifically interferes with RemoteApp streams used to publish individual applications via AVD.

The problem arises from modifications to Remote Desktop Protocol (RDP) shell handling, initiated by the installation of KB5070311 on December 1, 2025. Home and Pro users on personal devices are unlikely to encounter this issue due to the infrequent use of AVD outside enterprise settings.

Option 1: Conduct manual registry edits. Execute the following command in an elevated Command Prompt:

reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WinLogon\ShellPrograms\RdpShell.exe" /v "ShouldStartRailRPC" /t REG_DWORD /d 1 /f,

Microsoft has identified an issue with its November 2025 non-security preview update KB5070311, affecting OS builds 26200.7309 and 26100.7309.
Robert Langley · Thehackingpost

Afterward, restart the system. It is advised to back up the registry beforehand to prevent system instability.

Option 2: Utilize Known Issue Rollback (KIR), an automated mitigation tool. This fix will automatically deploy to Pro and Enterprise devices updating directly from Microsoft, with a rollout period of up to 24 hours starting December 12, 2025, at 6:00 PM PT. A device restart can expedite this process.

Enterprise administrators managing updates via IT policies can apply a targeted Group Policy using the MSI package KB5072033_25121301401 . Configure under Computer Configuration > Administrative Templates , then restart the affected systems.

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Organizations can review the Azure Portal under Messages ID: Q_P4-HFG for detailed insights. Microsoft is working on a permanent resolution, and the provided workarounds can be withdrawn once this fix is released.

This situation highlights the challenges of maintaining update reliability in hybrid cloud environments. Enterprise IT professionals are advised to monitor the Microsoft KB5070311 page and AVD RemoteApp documentation for further developments.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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