Microsoft KB Archive/255724

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Performance Problems on Proxy Servers with over 5,000 Simultaneous Connections

Article ID: 255724

Article Last Modified on 2/21/2007


  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server

This article was previously published under Q255724


On an extremely busy server with over 5,000 connections being made from the server by using the Connect Winsock call, the server may slow down when it responds to requests. The server may eventually stop responding.


To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack


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

This problem was first corrected in Windows 2000 Service Pack 1.


This behavior is known to occur only on proxy servers that are opening and closing large numbers of connections continually. When the Connect function is called, the server must search a table to determine whether there are other connections with the same source and destination. The algorithm that performs this search has been improved; scaling this operation is no longer an issue.

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe kbwin2000sp1fix KB255724