Microsoft KB Archive/241589

= Kernel Access Fault in Windows Terminal Server =

Article ID: 241589

Article Last Modified on 3/1/2007

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition Service Pack 4

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This article was previously published under Q241589



SYMPTOMS
Sessions to Terminal Server users may disappear on retail builds of Windows NT 4.0, Terminal Server Edition (sessions that are not connected to a Windows NT debugger session).



CAUSE
The way certain programs paint the screen can cause the Remote Desktop Protocol (RDP) to use an uninitialized variable and bugcheck the server.

This problem aggravates a path in SDGSendSDARect, which has an uninitialized variable for one rare path (bitmaps with a height of 1 and a width greater than or equal to 12). This uninitialized variable can affect later invocations of the function by causing a problem with a compression estimate that uses certain assumptions. When this problem occurs (a kernel access fault,) an error message appears. It is seen in the form of a disappearing session to a user on retail builds of Windows NT 4.0, Terminal Server Edition (that are not connected to a Windows NT debugger session).



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Keywords: kbbug kbfix KB241589

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