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Article ID: 919408 - Last Review: January 16, 2015 - Revision: 4.0

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Consider the following scenario:
  • You have a computer that is running Microsoft Windows XP Service Pack 2 (SP2). Alternately, you have a computer that is running Windows XP Service Pack 1 (SP1)and that has hotfix 811513 installed.
  • The computer has a primary Windows Internet Name Service (WINS) server assigned to it that resides in the local subnet and a secondary WINS server that is located in a hub site.
  • The computer switches the primary and secondary WINS server settings after one of the following conditions occurs:
    • Fifty percent of the Dynamic Host Configuration Protocol (DHCP) lease time has passed.
    • You run the nbtstat -RR command to update the NetBIOS names.
    • You run the ipconfig /renew command to reestablish TCP/IP connections.
In this scenario, the computer registers with the secondary WINS server and sends name update requests to the secondary WINS server, even though the primary WINS server is fully operational and the primary WINS server destination is reachable.

Additionally, when the computer switches the primary and secondary WINS server settings, the wide area network (WAN) traffic may increase because the secondary WINS server is located in a hub site.


This problem occurs because of an error in the functioning of the Netbt.sys protocol driver.


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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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.


To apply this hotfix, you must have Windows XP Service Pack 2 (SP2) installed on the computer.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

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 item in Control Panel.
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More information

For more information about the description of 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
kbnosurvey kbarchive kbautohotfix kbwinxppresp3fix kbwinxpsp3fix kbfix kbbug kbHotfixServer kbqfe KB919408
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