Microsoft KB Archive/247177

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Article ID: 247177

Article Last Modified on 1/25/2007


  • Microsoft Windows 98 Second Edition
  • Microsoft Windows 95

This article was previously published under Q247177


If you "hot undock," suspend, and then dock your laptop computer, when the computer resumes it may stop responding (hang) while the Dock Change message is displayed if no Dynamic Host Configuration Protocol (DHCP) server is available to respond to the DHCP Discover requests.


This behavior is caused by a timing issue in the DHCP code that allows multiple threads to modify the same data structure during an Advanced Configuration and Power Interface (ACPI) resume and a Plug and Play dock change event. Typically, only one thread has access to the data structure at a time.


A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English-language version of this fix should have the following file attributes or later:

   Date      Time    Version    Size    File name    Version   
09-Dec-1999  11:51  4.10.2224  65,279   Vdhcp.386   Windows 98 Second Edition 
08-Feb-2000  05:31  4.10.1661  55,159   Vdhcp.386   Windows 95 (all versions)


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


For additional information about Windows 98 and Windows 98 Second Edition hotfixes, click the article number below to view the article in the Microsoft Knowledge Base:

206071 General Information About Windows 98 and Windows 98 Second Edition Hotfixes

For additional information about Windows 95 hotfixes, click the article number below to view the article in the Microsoft Knowledge Base:

161020 Implementing Windows 95 Updates

Keywords: kbhotfixserver kbqfe kbenv kbhardware kbprb kbqfe KB247177