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.

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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:

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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.

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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

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

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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:

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