Two Authentication Prompts When You Use an ISAPI Filter for Authentication (830520)


The information in this article applies to:

  • Microsoft Internet Information Services version 6.0
  • Microsoft Commerce Server 2002

SYMPTOMS

When you use an Internet Services API (ISAPI) filter to implement authentication, you may receive two authentication prompts when you try to access the default document. For example, this behavior may occur when you are using Windows Authentication mode in Microsoft Commerce Server 2002.

CAUSE

The credentials that are supplied in the ISAPI filter when the filter handles the SF_NOTIFY_AUTHENTICATION notification are not used when Microsoft Internet Information Services (IIS) loads the default document. If the default document is not configured for anonymous access, the user is prompted for credentials again.

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

If you stop the IIS Admin service before you install this hotfix, you do not have to 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   Architecture
   ------------------------------------------------------------------------
   07-Nov-2003  18:56  6.0.3790.101      336,896  W3core.dll       x86
   07-Nov-2003  09:51  6.0.3790.101      937,472  W3core.dll       IA64

STATUS

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

MORE INFORMATION

If you are using Microsoft Commerce Server 2002 on Microsoft Windows Server 2003 with AuthFilter in Windows Authentication mode, this fix is required.

This hotfix corrects a problem in Microsoft Internet Information Services (IIS). Applications other than Commerce Server 2002 may also have this problem if IIS sends the SF_NOTIFY_AUTHENTICATION notification to the ISAPI filter and the filter then supplies the user credentials.
Modification Type:MinorLast Reviewed:10/26/2005
Keywords:kbHotfixServer kbQFE kbHotfixServer kbQFE kbfix kbBug kbQFE kbWinServ2003preSP1fix KB830520
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