DOCUMENT:Q325927  24-JUL-2002  [iis]
TITLE   :Unknown Comp Filter Priority When You Turn On HTTP Compression
PRODUCT :Internet Information Server
PROD/VER::5.0
OPER/SYS:
KEYWORDS:

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The information in this article applies to:

 - Microsoft Internet Information Services version 5.0 
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SYMPTOMS
========

After you turn on compression for dynamic or static content, the compression
filter priority shows the following status:

   **Unknown**

No Event Viewer error messages provide any more details about why the priority is
unknown or indicate whether the filter is currently working.

CAUSE
=====

A minor error occurs in the priority status that causes the Internet Services
Manager (ISM) user interface to show a status of "Unknown".


STATUS
======

Microsoft has confirmed that this is a problem in Internet Information Services
5.0.

MORE INFORMATION
================

After conclusive testing, Microsoft has determined that the compression filter
is working as designed, even if the priority is reported as "Unknown". If you
have turned on compression, you can verify that compression is working on the
Internet Information Services (IIS) computer:

NOTE: The test in this example uses a page named Postinfo.html. This page comes
with default installation of IIS and exists in the root of the Web site (if the
page and the Web site exist). To reach the page, use the following URL, where
localhost assumes that the test is being performed on the Web server:

   http://localhost/postinfo.html

1. Click Start, point to Programs, click Administrative Tools, and then open the
   Internet Services Manager.

2. Right-click the server name, and then click Properties.

3. In the Master Properties drop-down list, click to select WWW Services, and
   then click Edit.

4. Click the Service tab. Under HTTP Compression, locate and confirm the
   temporary folder location (the default is %windir%\IIS Temporary Compressed
   Files).

NOTE: If the priority is "Unknown", you cannot move the compression filter up or
down in the order of filters.

5. Open Microsoft Internet Explorer, and then type
   "http://localhost/postinfo.html" (without the quotation marks) in the address
   bar to access the Postinfo.html page.

6. Open Windows Explorer. To do this, click Start, point to Programs, click
   Accessories, and then click Windows Explorer.

7. Locate and open the folder that you accessed in step 4.

8. Locate a file that has a name such as $^~_gzip_d__inetpub_wwwroot_postinfo.

Steps to Reproduce the Behavior
-------------------------------

1. Turn on compression. For more information about how to do this, visit the
   following Microsoft Web site:

   Enabling HTTP Compression
   http://www.microsoft.com/windows2000/en/server/iis/htm/core/iihttpc.htm

2. Restart IIS.

3. Open the WWW Services Master Properties in the ISM, and then view the filter
   priority under ISAPI Filters.

Additional query words: iis 5

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Keywords          :  
Technology        : kbiisSearch kbiis500
Version           : :5.0
Issue type        : kbprb
Solution Type     : kbpending

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