Article ID: 818635
Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986This article applies only to Microsoft Windows 2000 SP4 and does not apply to other versions of Windows 2000.
(http://support.microsoft.com/kb/256986/ )Description of the Microsoft Windows registry
A portable computer may not be able to renew its Internet Protocol (IP) address from a Dynamic Host Configuration Protocol (DHCP) server after you remove the computer from a docking station or from a port replicator. Additionally, no errors are recorded in the system log, and this problem still occurs after you disable and then re-enable the network adapter.
This problem occurs because the computer cannot reach the DHCP server. Windows 2000 uses the Media Sense feature to remove protocols that are bound to a network adapter that is sensed as "down" or "disconnected." In the scenario that is described in the "Symptoms" section, the Internet Control Message Protocol (ICMP) send request returns a Pending status, Media Sense removes the TCP/IP protocol, and the network adapter is not detected because there are no protocols bound to the network adapter.
Hotfix informationA 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:
http://support.microsoft.com/contactus/?ws=supportNote 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.
PrerequisitesNo prerequisites are required.
Restart requirementYou must restart your computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace any other hotfixes.
File informationThe 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
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
To work around this problem, prevent your network adapter from detecting the link state by modifying the registry to disable the Media Sense feature for TCP/IP. To do this, follow these steps.
Note NetBIOS Extended User Interface (NetBEUI) and Internetwork Packet Exchange (IPX) do not recognize the Media Sense feature.
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
(http://support.microsoft.com/kb/239924/ )How to disable the "Media Sensing" feature for TCP/IP in Windows
For more information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:
816915For more information about the terminology that is used in this article, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/816915/ )New naming schema for Microsoft Windows software update packages
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates