Microsoft KB Archive/296529

= Demand Dialing Cannot Be Triggered with NAT If There Is a Destination Port Number in a Filter =

Article ID: 296529

Article Last Modified on 2/20/2007

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2

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This article was previously published under Q296529



SYMPTOMS
If you configure network address translation (NAT) on a Windows 2000-based server, the Demand-dial interface cannot be initialized with a destination TCP port number from a client computer that is connected to the private local area network (LAN). For example, if you configure TCP port 80 as the destination port in the Demand-dial interface, the client cannot initialize NAT dialing by using &quot;telnet IP_Address 80.&quot;



CAUSE
This problem occurs because Ipnat.sys passes the IP frame address to Ipfltdrv.sys instead of to the protocol layer (such as TCP or UDP).



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 18-May-2001 19:59  5.0.2195.3615  65,712  Ipnat.sys



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3.



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

Additional query words: kbNetworking

Keywords: kbbug kbfix kbwin2000presp3fix kbqfe kbwin2000sp3fix kbnetwork kbhotfixserver KB296529

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