FIX: A Web client may receive a "page cannot be displayed" error message when you run SSL in kernel mode in Windows Server 2003 Service Pack 1 (923051)

SYMPTOMS

When you run Secure Sockets Layer (SSL) in kernel mode in Microsoft Windows Server 2003, a Web client may receive a "page cannot be displayed" error message. This problem occurs when you use Microsoft Internet Information Services (IIS) 6.0. Additionally, an HTTP 400 (substatus 64) error message may be written to the IIS logs.

You may experience this problem when a Web client submits a form that has lots of data and uses a Microsoft Active Server Pages (ASP) application or a Microsoft ASP.NET Web application that uses lots of View State data.

RESOLUTION

Hotfix information

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:

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 Windows Server 2003 Service Pack 1 (SP1) installed to apply this hotfix.

Restart requirement

You must 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.Windows Server 2003 Service Pack 1 (SP1) x86 version

File name	File version	File size	Date	Time	Platform
Http.sys	5.2.3790.2750	290,304	19-Jul-2006	10:25	x86

Windows Server 2003 Service Pack 1 (SP1) IA-64 version

File name	File version	File size	Date	Time	Platform
Http.sys	5.2.3790.2750	796,160	19-Jul-2006	13:36	IA-64

Windows Server 2003 Service Pack 1 (SP1) x64 version

File name	File version	File size	Date	Time	Platform
Http.sys	5.2.3790.2750	537,600	19-Jul-2006	13:36	x64

MORE INFORMATION

In Windows Server 2003 SP1 and in later versions of Windows Server 2003, you can run SSL in kernel mode instead of default user mode. Kernel mode means that components or processes run in the core address space of the operating system.

Running SSL in kernel mode improves SSL performance because encryption and decryption operations are moved to the kernel. This change reduces the number of transitions between kernel mode and user mode.