Microsoft KB Archive/826240

= A Client Certificate on One Request Handle May Interfere with Secure Sockets Layer (SSL) Negotiations on Other Request Handles When You Use WinHTTP =

Article ID: 826240

Article Last Modified on 7/24/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)

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SYMPTOMS
When you use Microsoft Windows HTTP Services (WinHTTP), setting a client certificate on one request handle may interfere with Secure Sockets Layer (SSL) negotiations on other request handles that are sent to the same host or to the same port. As a result, if Microsoft SharePoint Portal Server is installed on the server, the Microsoft SharePointPS Search service does not crawl certain pages of the portal site that use a client certificate.



CAUSE
This issue occurs because, in a session, WinHTTP incorrectly processes concurrent SSL client authentication negotiation operations that use the same host or the same port.



Hotfix Information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

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

Prerequisites
No prerequisites are required.

Restart Requirement
You must restart your 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) 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 - 19-Aug-2003 21:46  5.2.3790.68  336,384  Winhttp.dll



WORKAROUND
To work around this problem, do one of the following, as appropriate to your situation:
 * Open a different session for each virtual directory on the server that requires a client certificate.

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 * Serialize the SetOption(CERT_CONTEXT) call in a session, and do not call WinHTTP when either a SendRequest or a ReceiveResponse call is in progress in the session.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe kbwinserv2003presp1fix KB826240

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