Microsoft KB Archive/154387

= Tapisrv.exe Thread Uses Excessive CPU Time =

Article ID: 154387

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q154387





SYMPTOMS
A thread in Tapisrv.exe begins using an excessive amount of processor time (as much as 95% to 100%) when you run a TAPI server application under a heavy load of phone calls.



CAUSE
This problem occurs when the thread that is using all the processor time has become stuck in an infinite loop due to a problem in the ring management code.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or 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

NOTE: This hotfix requires TAPI 2.1. Applying this hotfix with a previous version of TAPI may cause unpredictable behavior.



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.

Additional query words: 4.00

Keywords: kbhotfixserver kbqfe kbbug kbenv kbqfe KB154387

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