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FIX: "Underlying Connection Was Closed" Exception on Long Running Method Calls

If you call a Web service method, and if the method call takes a long time to return (typically more than 100 seconds), the client application may receive the following exception:
The underlying connection was closed
This may occur if all the following conditions are true:
  • You call the Web service method from a computer that is running Windows 98 Second Edition or Windows Millennium Edition.
  • You use a client application to set the Web service proxy timeout value to infinite.
  • The client application is developed by using Microsoft .NET Framework.
The network monitor trace shows that the client has closed the connection by using TCP FIN.
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone 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.

The English version of this fix 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.
   Date         Time   Version            Size    File Name         Platform   -------------------------------------------------------------------------   26-Apr-2003  04:12  1.0.3705.425      196,608  Aspnet_isapi.dll  x86   26-Apr-2003  04:06                      4,169  Aspnet_perf.h   26-Apr-2003  04:12                    513,302  Aspnet_perf.ini   26-Apr-2003  04:12                    510,714  Aspnet_perf2.ini   26-Apr-2003  04:12  1.0.3705.425       24,576  Aspnet_regiis.exe x86   26-Apr-2003  04:12  1.0.3705.425       28,672  Aspnet_wp.exe     x86   26-Apr-2003  03:36  1.0.3705.425       69,632  Corperfmonext.dll x86   26-Apr-2003  03:34  1.0.3705.425      303,104  Mscorjit.dll      x86   26-Apr-2003  14:29  1.0.3705.425    1,953,792  Mscorlib.dll      x86   24-Apr-2003  18:40                     10,284  Mscorlib.ldo   26-Apr-2003  03:35  1.0.3705.425    2,269,184  Mscorsvr.dll      x86   26-Apr-2003  03:35  1.0.3705.425    2,269,184  Mscorwks.dll      x86   01-Aug-2002  21:38                         15  Smartnav.htm   17-Oct-2002  17:55                      8,728  Smartnav.js   26-Apr-2003  14:29  1.0.3705.425    1,191,936  System.web.dll    x86				

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
The default proxy timeout value for the client is 100 seconds. You can modify the proxy timeout value by using the timeout property of the proxy as follows:
webserver.Service1 ws = new webserver.Service1();ws.Timeout = System.Threading.Timeout.Infinite;

Article ID: 819692 - Last Review: 02/12/2007 18:17:00 - Revision: 2.5

  • Microsoft .NET Framework 1.0
  • Microsoft .NET Framework Software Development Kit 1.0 Service Pack 2
  • Microsoft Windows 98 Second Edition
  • Microsoft Windows Millennium Edition
  • kbbug kbfix kbqfe kbhotfixserver KB819692