DOCUMENT:Q296458 15-AUG-2002 [iis] TITLE :IIS Disregards Host Headers When Using Keep-Alives PRODUCT :Internet Information Server PROD/VER::4.0,5.0 OPER/SYS: KEYWORDS:kbCOMIS kbWin2000sp3fix ====================================================================== ------------------------------------------------------------------------------- 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 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2002.