Microsoft KB Archive/941386

= FIX: Error message when you run an ASP.NET 2.0 Web application that is built on the .NET Framework 2.0 after you install the MS07-040 security update: &quot;Type 'System.Web.HttpHeaderCollection' is not marked as serializable&quot; =

Article ID: 941386

Article Last Modified on 9/24/2007

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APPLIES TO


 * Microsoft .NET Framework 2.0
 * Windows Vista Home Premium
 * Windows Vista Ultimate
 * Windows Vista Business
 * Windows Vista Enterprise
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Business 64-bit Edition
 * Windows Vista Enterprise 64-bit Edition

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SYMPTOMS
Consider the following scenario. You install the MS07-040 security update. Then, you run a Microsoft ASP.NET 2.0 Web application that is built on the Microsoft .NET Framework 2.0. In this scenario, you may receive an exception error message that resembles the following:

Event Type: Warning

Event Source: ASP.NET 2.0.50727.0

Event Category: Web Event

Event ID: 1309

Date: 12/07/2007

Time: 10:24:38

User: N/A

Computer:

Description:

Event code: 3005

Event message: An unhandled exception has occurred.

Event time: 12/07/2007 10:24:38

Event time (UTC): 12/07/2007 8:24:38

Event ID: aa58f4d35bc547aeafd7c417967bdd8d

Event sequence: 8

Event occurrence: 1

Event detail code: 0

Application information:

Application domain: /LM/W3SVC/1/Root/

Trust level: Full

Application Virtual Path: /

Application Path: D:\

Machine name:

Process information:

Process ID:

Process name: w3wp.exe

Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:

Exception type: EndPointException

Exception message: Type 'System.Web.HttpHeaderCollection' in Assembly 'System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable.

Note This problem also occurs in the .NET Framework 2.0 for Windows Vista.



CAUSE
This problem occurs because the public headers properties of the Request.Headers property and of the Response.Headers property become non-serializable after you install the MS07-040 security update.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only 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 .NET Framework 2.0 service pack that contains this hotfix.

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

http://support.microsoft.com/contactus/?ws=support

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
You must have the .NET Framework 2.0 installed to apply this hotfix.

Restart requirement
You do not have to restart the 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 item in Control Panel.

The .NET Framework 2.0, x64-based versions


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 more information, 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

Keywords: kbfix kbqfe kbpubtypekc kbexpertiseadvanced kbhotfixserver KB941386

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