Q321561: Phantom Connection Count When Keep-Alive Conns Switch HostHeader
Article: Q321561
Product(s): Internet Information Server
Version(s): 4.0,5.0
Operating System(s):
Keyword(s): kbCOMIS kbWin2000sp3fix
Last Modified: 15-AUG-2002
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The information in this article applies to:
- Microsoft Internet Information Server version 4.0
- Microsoft Internet Information Services version 5.0
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SYMPTOMS
========
After you install the fix from the following Microsoft Knowledge Base article
Q319733 MS02-018: April 2002 Cumulative Patch for Internet Information
Services
a Web site may return the following error message:
HTTP 403.9: Access Forbidden
CAUSE
=====
If a single site is mapped to multiple Domain Name System (DNS) names and
multiple users switch between different DNS names in that site, the connection
count is distorted when a keep-alive connection connects to different host
headers that are mapped to a single site. A phantom connection count is
enumerated each time a connection switches host headers.
RESOLUTION
==========
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.
To resolve this problem immediately, download the fix by clicking the download
link later in this article or 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 usual 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 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
----------------------------------------------------
30-Apr-2002 07:31 4.2.776.1 214,544 Adsiis.dll
30-Apr-2002 07:32 4.2.776.1 330,672 Asp.dll
30-Apr-2002 07:32 4.2.776.1 34,384 Clusiis4.dll
30-Apr-2002 07:31 4.2.776.1 55,392 Httpodbc.dll
30-Apr-2002 07:31 4.2.776.1 98,912 Iischema.dll
30-Apr-2002 07:30 4.2.776.1 63,984 Iislog.dll
30-Apr-2002 07:30 4.2.776.1 185,792 Infocomm.dll
30-Apr-2002 07:30 4.2.776.1 29,520 Iscomlog.dll
30-Apr-2002 07:31 4.2.776.1 38,256 Ssinc.dll
30-Apr-2002 07:31 4.2.776.1 25,360 Sspifilt.dll
30-Apr-2002 07:31 4.2.776.1 231,104 W3svc.dll
30-Apr-2002 07:30 4.2.776.1 88,032 Wam.dll
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 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 Filename
------------------------------------------------------
19-Apr-2002 23:08 5.0.2195.5624 348,944 W3svc.dll
WORKAROUND
==========
To work around this problem if you have already applied MS02-018 to your Web
server, follow these steps:
1. Click Start, point to Programs, point to Administrative Tools, and then click
Internet Services Manager.
2. Right-click the Web site, and then click Properties.
3. On the Web Site tab, click to select Unlimited Connections.
NOTE: Make sure that you consider any licensing implications that may be involved
when you change this property.
STATUS
======
Microsoft has confirmed that this is a problem in IIS 4.0 and 5.0. This problem
was first corrected in Windows 2000 Service Pack 3.
MORE INFORMATION
================
For additional information, click the article number below to view the article
in the Microsoft Knowledge Base:
Q272235 Internet Connector License Types for Windows 2000
Additional query words: kbIISCom
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Keywords : kbCOMIS kbWin2000sp3fix
Technology : kbiisSearch kbiis500 kbiis400
Version : :4.0,5.0
Hardware : x86
Issue type : kbbug
Solution Type : kbfix
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