Microsoft KB Archive/875501

= You are unexpectedly disconnected from your VPN session after several minutes in Windows Server 2003 =

Article ID: 875501

Article Last Modified on 7/24/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise x64 Edition
 * Microsoft Windows Server 2003, 64-Bit Datacenter Edition

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SYMPTOMS
Your VPN connection unexpectedly disconnects after several minutes. This problem occurs after your Microsoft Windows Server 2003-based computer connects to an external firewall device or to a network address translation (NAT) device and after you then establish a virtual private network (VPN) connection to a VPN server.



CAUSE
This problem may occur if the VPN server does not process certain Point-to-Point Tunneling Protocol (PPTP) control messages from the Windows Server 2003-based VPN client.



RESOLUTION
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
No prerequisites are required.

Restart requirement
You must restart your computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

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 tool in Control Panel.

Windows Server 2003, 32-bit editions
  Date         Time   Version            Size    File name --  23-Jul-2004  20:59  5.2.3790.196       80,384  Ipnat.sys

Windows Server 2003, 64-bit editions
  Date         Time   Version            Size    File name --  23-Jul-2004  19:59  5.2.3790.196      262,144  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.



MORE INFORMATION
For additional information about the standard terminology that is used to describe Microsoft software updates, 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

For additional information about this problem in Microsoft Windows 2000, click the following article number to view the article in the Microsoft Knowledge Base:

843357 You are unexpectedly disconnected from your VPN session after several minutes

For additional information about this problem in Microsoft Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:

840654 Your VPN connection is disconnected after several minutes in Windows XP

Additional query words: router wireless

Keywords: kbqfe kbhotfixserver kbwinserv2003presp1fix kbfix kbbug kbprb KB875501

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