Event ID 4199 is logged in the System log when you assign or change an IP address on a Windows Vista-based computer

Consider the following scenario:

• You are running a Windows Vista-based computer in a network environment. There are multiple computers in this network.
• You assign or change the IP address for the Windows Vista-based computer. You do this either manually or by using an application.

In this scenario, you receive the following error message about a network error that concerns duplicate address detection (DAD):Additionally, the following event is logged in the System log:

Event ID: 4199
Event Source: Tcpip
Event Type: Error
Description:
The system detected an address conflict for IP address <IP address> with the system having network hardware address <MAC address>. Network operations on this system may be disrupted as a result.

After you assign or change an IP address on a Windows Vista-based computer, the system searches the network for a computer that is already using this IP address. If the search reveals no computer that is already using this IP address, the IP address is officially assigned to the Windows Vista-based computer. The problem that is described in the "Symptoms" section occurs if another computer sends a ping message to the new IP address before the system finishes the search process. The system was not designed to be pinged while it is searching for a new IP address.

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.

Prerequisites

No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

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.

Windows Vista, x86-based versions

Windows Vista, 64-bit versions

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

For more information about duplicate address detection (DAD), visit the following MSDN Web site: