Microsoft KB Archive/944529

= When a Windows Vista-based computer is awakened from sleep by a magic packet, and the WakeOnLAN feature is enabled, the computer's desktop is displayed unexpectedly =

Article ID: 944529

Article Last Modified on 11/13/2007

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APPLIES TO


 * Windows Vista Enterprise 64-bit Edition
 * Windows Vista Home Basic 64-bit Edition
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Business
 * Windows Vista Business 64-bit Edition
 * Windows Vista Enterprise
 * Windows Vista Home Basic
 * Windows Vista Home Premium
 * Windows Vista Starter
 * Windows Vista Ultimate

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SYMPTOMS
Consider the following scenario:
 * A Windows Vista-based computer is awakened from sleep by a magic packet.
 * The WakeOnLAN feature is enabled on the computer.

In this scenario, the computer desktop is displayed unexpectedly.

Note For more information about magic packets, see the &quot;More information&quot; section.



CAUSE
This problem occurs if there is an active process when the computer enters sleep mode. For example, this problem occurs if a mouse is moved or if any key is pressed on the keyboard as the computer enters sleep mode.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
A magic packet is a standard wake-up frame that targets a specific network interface. In most cases, a wake-up frame or a magic packet enables remote access to a computer that is in a power-saving state. However, some networking protocols use these packets for other purposes. For example, routers use Address Resolution Protocol (ARP) packets to periodically confirm the presence of a computer. Such protocols do not use these packets to wake computers. However, on some networks, network traffic may mistakenly wake a remote computer. These unwanted wake-up events may occur in especially noisy environments such as enterprise networks. By default, the WakeOnLAN feature is disabled in Windows Vista.

Keywords: kbtshoot kbprb KB944529

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