DOCUMENT:Q142634 08-AUG-2001 [winnt] TITLE :Multiple Processes Are Able to Open the Same Winsock Port PRODUCT :Microsoft Windows NT PROD/VER:winnt:3.51,3.51,4.0,4.0 OPER/SYS: KEYWORDS:kbnetwork kbAPI kbSDKPlatform kbWinsock kbGrpDSNet ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server versions 3.51,4.0, 3.51, 4.0 - Microsoft Windows NT Workstation version 3.51,4.0 ------------------------------------------------------------------------------- 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, please see the following article in the Microsoft Knowledge Base: Q152734 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 : kbnetwork kbAPI kbSDKPlatform kbWinsock kbGrpDSNet Technology : kbWinNTsearch kbWinNTWsearch kbWinNT351search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTS351 kbWinNTS351search Version : winnt:3.51,3.51,4.0,4.0 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.