Microsoft KB Archive/262486

= 100% CPU utilization or access violations when you use Basic authentication in IIS =

Article ID: 262486

Article Last Modified on 7/3/2006

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APPLIES TO


 * Microsoft Internet Information Server 4.0

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This article was previously published under Q262486



We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/prodtech/IIS.mspx



SYMPTOMS
When you use Basic authentication in Internet Information Server (IIS), the CPU utilization may reach 100%, or you may receive access violations (AVs).



WORKAROUND
To work around this problem, do not use Basic authentication.



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Windows NT service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

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 typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:

 Date      Time       Version      Size    File name     Platform 6/01/2000 2:48:00PM 4.2.746.1    330,080 Asp.dll       x86 6/01/2000 2:46:16PM 4.2.746.1    185,792 Infocomm.dll  x86 6/01/2000 2:47:10PM 4.2.746.1    38,256  Ssinc.dll     x86 6/01/2000 2:47:18PM 4.2.746.1    25,360  Sspifilt.dll  x86 6/01/2000 2:46:58PM 4.2.746.1    228,496 W3svc.dll     x86



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Additional query words: TsFlushCacheUser

Keywords: kbbug kbfix kbqfe kbhotfixserver KB262486

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