Microsoft has formally acknowledged a disruptive bug in its newest Home windows updates, confirming that the November 2025 non-security preview replace KB5070311 (OS builds 26200.7309 and 26100.7309) and subsequent patches are inflicting RemoteApp connection failures in Azure Digital Desktop (AVD) environments.
The difficulty primarily impacts enterprise customers operating Home windows 11 variations 24H2 and 25H2, in addition to Home windows Server 2025, however doesn’t have an effect on all desktop periods.
Affected organizations report that RemoteApp streams designed to publish particular person functions by way of AVD fail to attach after the replace.
This stems from adjustments to Distant Desktop Protocol (RDP) shell dealing with, triggered by putting in KB5070311 on December 1, 2025. Dwelling and Professional customers on private gadgets face minimal threat, as AVD deployment is uncommon exterior enterprise settings.
“People utilizing Home windows Dwelling or Professional editions… are most unlikely to expertise this difficulty,” Microsoft said in its assist advisory. Enterprise IT groups, nonetheless, are scrambling, as disruptions are affecting virtualized workloads that depend on RemoteApp for safe app supply.
Microsoft urges quick workarounds.
Possibility 1 entails handbook registry edits: Launch an elevated Command Immediate and run
reg add “HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionWinLogonShellProgramsRdpShell.exe” /v “ShouldStartRailRPC” /t REG_DWORD /d 1 /f,
then restart. Customers should again up the registry first to keep away from broader instability.
Possibility 2 leverages Identified Problem Rollback (KIR), Microsoft’s automated mitigation instrument. For Professional and Enterprise gadgets that replace instantly from Microsoft, the repair rolls out mechanically, although it might take as much as 24 hours from December 12, 2025, 6:00 PM PT.
A tool restart accelerates deployment. Enterprise admins managing updates by way of IT insurance policies can deploy a focused Group Coverage utilizing the MSI package deal KB5072033_25121301401. Configure underneath Laptop Configuration > Administrative Templates, then restart affected programs.
Impacted organizations can verify the Azure Portal underneath Messages ID: Q_P4-HFG for tailor-made insights. Microsoft guarantees a everlasting repair in an upcoming replace, after which workarounds may be eliminated.
This incident underscores ongoing challenges with Home windows replace reliability in hybrid cloud environments. As enterprises lean on AVD for zero-trust app entry, such breaks may expose operational dangers amid rising RDP-targeted assaults. IT execs ought to monitor the Microsoft KB5070311 web page and the AVD RemoteApp docs.
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