Microsoft Windows Update Alert: Azure Virtual Desktop RemoteApp Issue

Microsoft has confirmed a critical problem caused by recent Windows updates affecting Azure Virtual Desktop (AVD) RemoteApp connections.

Affected Versions:

• Windows 11 24H2 & 25H2

• Windows Server 2025

• Update: KB5070311 (Nov/Dec 2025 Preview)

After installing this update, RemoteApp sessions may fail to connect, although full desktop sessions are generally unaffected. The issue is linked to changes in Remote Desktop Protocol (RDP) shell handling.

Recommended Mitigations:

1. Apply a temporary registry fix (ensure backups are taken).

2. Use Known Issue Rollback (KIR):

   • Automatically applied for devices updating directly from Microsoft.

   • Enterprise environments can deploy the Group Policy MSI (KB5072033).

Admins can also check the Azure Portal (Message ID: Q_P4-HFG) for environment-specific guidance. Microsoft has indicated that a permanent fix will be included in a future update.

Key Takeaway:
This incident underscores the importance of testing preview updates in hybrid and cloud environments before rolling them out to production.

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