Microsoft KB Archive/304340

= The ISA Server response to client options requests is limited to a predefined set =

Article ID: 304340

Article Last Modified on 10/29/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2000 Standard Edition

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This article was previously published under Q304340



IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
When you Web publish a Web Distributed Authoring and Versioning (WebDAV) folder, external clients may not be able to gain access to the folder.

The hotfix that is described in this article corrects a problem with Web publishing WebDAV folders with Internet Security and Acceleration (ISA) Server by allowing ISA Server to respond correctly to the Web browser by sending the actual Options that are sent by the WebDAV server.



CAUSE
This is an example of a normal HTTP response by a WebDAV server:

HTTP/1.1 200 OK

Server: Microsoft-IIS/5.0

Date: Wed, 11 Jul 2001 20:43:45 GMT

Allow-Extension: urn:schemas:httpmail, http://schemas.microsoft.com/repl/ MS-Author-Via: DAV

Public-Extension: urn:schemas:httpmail, http://schemas.microsoft.com/repl/ Content-Length: 0

Accept-Ranges: rows

DASL: 

DAV: 1, 2

Allow: OPTIONS, TRACE, GET, HEAD, DELETE, COPY, MOVE, PROPFIND, PROPPATCH, SEARCH, SUBSCRIBE, UNSUBSCRIBE, POLL, BDELETE, BCOPY, BMOVE, BPROPPATCH, BPROPFIND, MKCOL, LOCK, UNLOCK

Public: OPTIONS, TRACE, GET, HEAD, DELETE, PUT, POST, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK, SEARCH, SUBSCRIBE, UNSUBSCRIBE, POLL, BDELETE, BCOPY, BMOVE, BPROPPATCH, BPROPFIND

MS-WebStorage: 6.0.5686

Cache-Control: private

However, if you use Web publishing to make this site available, ISA Server filters the Options field and returns the following canned response to the requesting browser:

HTTP/1.1 200 OK

Content-Length: 0

Date: Wed, 11 Jul 2001 20:44:38 GMT

Public: GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, CONNECT

Allow: GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, CONNECT

Cache-Control: private

As you can see, not all of the Options fields are passed to the client. This causes the client to be unable to connect.



RESOLUTION
In addition to applying the hotfix that is described below, please add the following registry key:

HKLM\System\CurrentControlSet\Services\W3Proxy\Parameters

Value Name: PassOPTIONSToPublishedServer

Data Type : REG_DWORD

Data : 1

Default : 0

Set this parameter to 1. The data can be any non-zero value.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

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

313139 How to obtain the latest Internet Security and Acceleration Server 2000 Service Pack

The English version of this fix should have the following file attributes or later:   Date         Time   Version      Size     File name -  26-Aug-2001  17:34  3.0.1200.69  381,712  W3proxy.exe



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Microsoft Internet Security and Acceleration Server 2000 Service Pack 1.

Additional query words: HTTP options

Keywords: kbproductlink kbqfe kbhotfixserver kbbug kbenv kbfix KB304340

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