Socket programs do not return notification events for the WSAEnumNetworkEvents function call in Windows 2000 Server SP4

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Assume the following scenario: A Winsock program is running on your Microsoft Windows 2000 Server-based computer with Service Pack 4 (SP4) applied. Additionally, the hotfix that is described in the following Microsoft Knowledge Base article is installed on your computer:
839045 Socket applications quit with a WSAEWOULDBLOCK error in Windows 2000 Server
The socket program creates a socket and then uses the WSAEventSelect function to select the FD_READ event. The socket program also uses the WSAWaitForMultipleEvent function to wait for data on the listening socket.

In this scenario, you may notice the following symptoms:
  • The socket program on the client computer does not return the FD_READ network event notification on the connected socket for the WSAEnumNetworkEvents function call.
  • The WSAWaitForMultipleEvent function call is not returned when data arrives. Therefore, the function call times out.
  • The socket program does not read data, even though the client computer is still connected to the listening socket.
  • The socket program does not read data, even though there is data available to read from the socket.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


This hotfix requires Windows 2000 Server SP4.

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix replaces the hotfix from Knowledge Base article 839045.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date         Time   Version            Size    File name-----------------------------------------------------------08-Jan-2005  17:58  5.0.2195.7019     119,248  Afd.sys19-Jun-2003  20:05  5.0.2195.6602     108,816  Msafd.dll        19-Jun-2003  20:05  5.0.2195.6706     332,144  Tcpip.sys19-Jun-2003  20:05  5.0.2195.6655      16,240  Tdi.sys19-Jun-2003  20:05  5.0.2195.6601      17,680  Wshtcpip.dll      
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
For additional information about the standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Article ID: 884843 - Last Review: 01/15/2015 16:21:15 - Revision: 2.0

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