Microsoft KB Archive/840654

= Your VPN connection is disconnected after several minutes in Windows XP =

Article ID: 840654

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional for Itanium-based systems

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SYMPTOMS
If you are using an external firewall device or a network address translation (NAT) device on a Microsoft Windows XP-based computer, and you establish a virtual private network (VPN) connection, the VPN connection may be disconnected after about five minutes.



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

322389 How to obtain the latest Windows XP service pack

Hotfix information
A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
To install this hotfix on a computer that is running Windows XP, 64-Bit Edition, you must have Service Pack 1 installed. No prerequisites are required for computers that are running a 32-bit edition of Windows XP.

File information
The English version of this hotfix has the file attributes (or later) 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 tool in Control Panel.

Windows XP, 32-bit editions
  Date         Time   Version         Size    File name     Service pack --  10-Apr-2004  19:24  5.4.15.0        26,112  Xpsp1hfm.exe 20-Apr-2004 23:55  5.1.2600.148    76,288  Ipnat.sys            (none) 20-Apr-2004 23:58  5.1.2600.1517   79,616  Ipnat.sys              SP1

Windows XP 64-Bit Edition
  Date         Time   Version        Size     File name 21-Apr-2004 00:00  5.1.2600.1517  281,088  Ipnat.sys



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Microsoft Windows XP Service Pack 2.



MORE INFORMATION
For additional information about the terminology that is used in this article, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: router

Keywords: kbqfe kbhotfixserver kbwinxpsp2fix kbwinxppresp2fix kbfix kbbug KB840654

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