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Remote Desktop Service cannot be restarted if Keep-Alive feature is enabled

If the RDP Keep-Alive feature is enabled on a Windows Server 2008 (or Windows Server 2008 R2) server, manually stopping the Remote Desktop Services service (Windows Server 2008 R2) or Terminal Services service (Windows Server 2008) will leave the server in an unstable state: restarting the service will not re-enable RDP functionality, and the server will hang during shutdown.
The keep-alive thread is started by the Remote Desktop Services (Terminal Services) service if Keep-Alive is enabled, however it runs in Kernel mode and can therefore not be terminated automatically when the service stops.
Do not attempt to stop or restart the Remote Desktop Services (Terminal Services) service if the RDP keep-alive mechanism is enabled.
When Keep-Alive is enabled and the Remote Desktop Services (Terminal Services) service is stopped, its svchost.exe process will remain in the Task list, even though the service is reported to have stopped correctly.  When the service is started again, a new svchost.exe will be started however the server will not accept incoming RDP connections due to inconsistency in the TermDD driver state.

The Keep-Alive feature can be enabled by Group Policy:

Windows Server 2008 R2:

Computer Configuration\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Connections

Configure Keep-Alive Connection Inteval

Windows Server 2008:

Computer Configuration\Administrative Templates\Windows Components\Terminal Services\Terminal Server\Connections

Configure Keep-Alive Connection Inteval

To configure directly in the registry:

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server]

RDP;Keep-Alive;KeepAlive;hang;shutdown;TermService;Remote Desktop
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Article ID: 2507353 - Last Review: 02/21/2011 21:35:00 - Revision: 1.0

Windows Server 2008 Datacenter, Windows Server 2008 Datacenter without Hyper-V, Windows Server 2008 Enterprise, Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 Datacenter without Hyper-V, Windows Server 2008 R2 Enterprise, Windows Server 2008 R2 Enterprise without Hyper-V, Windows Server 2008 R2 Standard, Windows Server 2008 R2 Standard without Hyper-V, Windows Server 2008 Service Pack 2, Windows Server 2008 Standard

  • KB2507353