Microsoft KB Archive/831138

= FIX: A .NET Framework application that uses the System.Net.WebRequest method very frequently experiences OutOfMemoryException errors =

Article ID: 831138

Article Last Modified on 4/7/2006

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APPLIES TO


 * Microsoft .NET Framework 1.1

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SYMPTOMS
If you create an application by using the Microsoft .NET Framework, and the application uses the System.Net.WebRequest method very frequently, you experience an OutOfMemoryException error when you run the application.



CAUSE
The .NET Framework uses the ServicePoint class to handle connections to the Internet. If the Web browser is configured to use a proxy server, only one ServicePoint connection object is created for all the connections for each application. However, if the computer is connected directly to the Internet, and the Web browser is not configured to use a proxy server, a ServicePoint connection object is created for each unique connection.

The System.Net namespace pins some memory to make a native call every time that the WebRequest object is invoked. However, the memory is not collected correctly when the ServicePoint object is disposed. If an application creates many ServicePoint objects, an OutOfMemoryException error occurs because the memory becomes fragmented in the unmanaged heap.

This problem may also occur if the computer is configured behind a proxy or a firewall that has a firewall client installed and the Web browser is not configured to use a proxy server.



Software update information
A supported software update 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 software update may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Microsoft .NET Framework 1.1 service pack that contains this software update.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the software update. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;[LN;CNTACTMS]

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 do have to restart your computer after you apply this software update.

Software update replacement information
This software update does not replace any other software updates.

File information
The English version of this software update 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 -  23-Oct-2003  01:56  1.1.4322.962    258,048  Aspnet_isapi.dll 23-Oct-2003 01:56  1.1.4322.962     20,480  Aspnet_regiis.exe 23-Oct-2003 01:56  1.1.4322.962     32,768  Aspnet_state.exe 23-Oct-2003 01:56  1.1.4322.962     32,768  Aspnet_wp.exe 23-Oct-2003 01:47  1.1.4322.962     94,208  Perfcounter.dll 23-Oct-2003 23:36  1.1.4322.962  1,220,608  System.dll 23-Oct-2003 23:37  1.1.4322.962  1,253,376  System.web.dll 23-Oct-2003 23:36  1.1.4322.962    241,664  System_messaging.dll 23-Oct-2003 23:36  1.1.4322.962    323,584  System_runtime_remoting.dll 23-Oct-2003 23:36  1.1.4322.962    131,072  System_runtime_serialization_formatters_soap.dll 23-Oct-2003 23:36  1.1.4322.962    819,200  System_web_mobile.dll 23-Oct-2003 23:36  1.1.4322.962    569,344  System_web_services.dll 23-Oct-2003 23:37  1.1.4322.962  1,335,296  System_xml.dll 16-May-2003 00:49                   33,522  Installpersistsqlstate.sql 16-May-2003 00:49                   34,150  Installsqlstate.sql 23-Oct-2003 01:51                   14,472  Webuivalidation.js



WORKAROUND
To work around this problem, configure your Web browser to use a proxy server. For example, you can configure your Web browser to use http://proxyserver:80.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section of this article.



MORE INFORMATION
For additional information about the terminology that is used to describe Microsoft product 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

Additional query words: oom

Keywords: kbbug kbfix kbqfe kbnetframe110presp1fix kbhotfixserver KB831138

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