Deletion of UDP Mappings May Be Delayed and Cause UDP Traffic to Be Incorrectly Redirected (275212)

The information in this article applies to:

Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Professional

This article was previously published under Q275212

SYMPTOMS

User Datagram Protocol (UDP) mappings on a Network Address Translation (NAT) server are not always deleted in a timely manner. Subsequently, some UDP traffic may be incorrectly redirected for a short time, causing the traffic to be temporarily unavailable.

CAUSE

The NAT driver does not delete the UDP mappings that are specified in the deletion request. The mappings are physically removed only at a certain interval. This may result in a packet being directed to the wrong destination.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

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

   Date        Time    Version      Size    File name
   --------------------------------------------------
   10/04/00  6:16pm  5.0.2195.2417  65,616  Ipnat.sys

STATUS

Microsoft has confirmed that this is a problem in Microsoft Windows 2000. This problem was first corrected in Windows 2000 Service Pack 2.

MORE INFORMATION

For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Modification Type:	Minor	Last Reviewed:	9/26/2005
Keywords:	kbHotfixServer kbQFE kbbug kbfix kbWin2000PreSP2Fix KB275212