FIX: Multiple cookies may be merged under one Set-Cookie header in the HTTP response when a .NET Framework 2.0 application calls the "HttpListenerResponse.SetCookie" method

When a Microsoft .NET Framework 2.0 application calls the HttpListenerResponse.SetCookie method, multiple cookies may be merged under one Set-Cookie header in the HTTP response. This problem occurs when you use HttpOnly cookies or non-RFC 2965 cookies.

Note A managed client merges the multiple cookies under one Set-Cookie header before the managed client presents the stream to the client application. Unmanaged client applications and non-RFC 2965 client applications receive multiple Set-Cookie headers that are written by the server.

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: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.

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

The .NET Framework 2.0, x86-based versions

The .NET Framework 2.0, Itanium architecture versions

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

After you apply this hotfix, you must use the HttpListenerResponse.Headers.Add method to avoid the merging of multiple cookies under one Set-Cookie header.