A Client Certificate on One Request Handle May Interfere with Secure Sockets Layer (SSL) Negotiations on Other Request Handles When You Use WinHTTP (826240)


The information in this article applies to:

  • Microsoft Windows Server 2003, Standard Edition
  • Microsoft Windows Server 2003, Enterprise Edition

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.

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

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.

    -or-
  • 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.
Modification Type:MinorLast Reviewed:10/27/2005
Keywords:kbHotfixServer kbQFE kbBug kbfix kbQFE kbWinServ2003preSP1fix KB826240 kbAudITPRO
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