You are unexpectedly disconnected from your VPN session after several minutes in Windows Server 2003 (875501)



The information in this article applies to:

  • Microsoft Windows Server 2003, Standard Edition
  • Microsoft Windows Server 2003, Web Edition
  • Microsoft Windows Server 2003, Enterprise Edition
  • Microsoft Windows Server 2003, Datacenter Edition
  • Microsoft Windows Server 2003, 64-Bit Enterprise Edition
  • Microsoft Windows Server 2003, 64-Bit Datacenter Edition

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, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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 "Applies to" 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


Modification Type:MinorLast Reviewed:6/1/2006
Keywords:kbQFE kbHotfixServer kbWinServ2003preSP1fix kbfix kbBug kbprb KB875501 kbAudITPRO