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Q296458: IIS Disregards Host Headers When Using Keep-Alives

Article: Q296458
Product(s): Internet Information Server
Version(s): 4.0,5.0
Operating System(s): 
Keyword(s): kbCOMIS kbWin2000sp3fix
Last Modified: 15-AUG-2002

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Internet Information Services version 5.0 
- Microsoft Internet Information Server version 4.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

When you use Host Headers to configure IIS to host multiple sites using the same
IP address, if the client is using HTTP/1.1 Keep-Alives and issues a request to
Host Site A on the IIS server, and then issues a request over the same HTTP
keep-alive connection to Host Site B by changing the Host Header, IIS disregards
this Host Header and attempts to fulfill the request on the original host site.

RESOLUTION
==========

IIS 5.0:

To resolve this problem, obtain the latest service pack for Windows 2000. For
additional information, click the following article number to view the article
in the Microsoft Knowledge Base:

  Q260910 How to Obtain the Latest Windows 2000 Service Pack

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

  Date      Time        Version        Size      File name    
-------------------------------------------------------------
  5/8/2001  07:00p     5.0.2195.3589   357,648   W3svc.dll


IIS 4.0:

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 service pack that contains this
fix.

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
  ---------------------------------------------------------------
  06/07/2001   20:09   4.2.766.1     214,544   Adsiis.dll      x86
  06/07/2001   20:09   4.2.766.1     330,672   Asp.dll         x86
  06/07/2001   20:08   4.2.766.1      55,392   Httpodbc.dll    x86
  06/07/2001   20:09   4.2.766.1      98,912   Iischema.dll    x86
  06/07/2001   20:07   4.2.766.1      63,472   Iislog.dll      x86
  06/07/2001   20:07   4.2.766.1     185,792   Infocomm.dll    x86
  06/07/2001   20:07   4.2.766.1      29,520   Iscomlog.dll    x86
  06/07/2001   20:08   4.2.766.1      38,256   Ssinc.dll       x86
  06/07/2001   20:08   4.2.766.1      25,360   Sspifilt.dll    x86
  06/07/2001   20:08   4.2.766.1     229,536   W3svc.dll       x86
  06/07/2001   20:08   4.2.766.1      88,032   Wam.dll         x86

STATUS
======

Microsoft has confirmed that this is a problem in Internet Information Server
4.0 and Internet Information Services 5.0. This problem was first corrected in
Windows 2000 Service Pack 3.


Additional query words: kbIISCom

======================================================================
Keywords          : kbCOMIS kbWin2000sp3fix 
Technology        : kbiisSearch kbiis500 kbiis400
Version           : :4.0,5.0
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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