Microsoft KB Archive/142634

= Multiple Processes Are Able to Open the Same Winsock Port =

Article ID: 142634

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q142634





SYMPTOMS
A Winsock application may appear to have stopped responding or it may not be able to send or receive data. All other services and applications, including other Winsock applications, continue to function without problems.



CAUSE
On systems running multiple Winsock applications that request the same specific port, repeated requests for a Winsock port that was in the process of being opened could result in two or more of the processes being assigned the port. The last process assigned would continue to function normally, while the other processes would fail to send or receive data over the port.



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

As a temporary solution, an updated version of Afd.sys has been created to correct the problem. After applying the fix, the system must be restarted before the change will take effect.



STATUS
Microsoft has confirmed this to be a problem in Windows NT versions 3.51 and 4.0. This problem was corrected in the latest Microsoft Windows NT 4.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: prodnt

Keywords: kbapi kbnetwork kbwinsock KB142634

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