BUG: Error message when you try to upload a file from a Windows Vista client to a server that is running IIS 6.0: "Cannot read from source file or disk"

When you try to upload a document to a server that is running Internet Information Services (IIS) 6.0, you may receive an error message that resembles the following: If you click Try Again when you receive the error message, you receive the same error message again. If you click Cancel, the file that you uploaded is deleted from the server.

This issue occurs when the following conditions are true:

• You try to upload the file from a client computer that is running Windows Vista.
• The document was created in Microsoft Office 2003 or in an earlier version of Office.
• You try to upload the file by using the World Wide Web Distributed Authoring and Versioning (WebDAV) extension to the HTTP protocol.
• IIS content is stored on a remote UNC share.
• Server Message Block (SMB) opportunistic locking is disabled on the server that is running IIS.

Note This problem does not occur in Microsoft Office SharePoint or in other programs that do not depend on the IIS server-side implementation of WebDAV.

Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.

The Windows Vista WebDAV client sends an "If: (<opaquelocktoken:GUID>)" header together with a PROPPATCH request. The PROPPATCH request is sent after the PUT request to upload the file. This behavior causes IIS to try to use OLE structured storage to write properties to the file while the file is being committed to disk on another thread. A network trace shows the PUT request succeeds with status code 207. However, the PROPPATCH request may fail with error code 500. The PROPPATCH request may also fail with error code 405 because an extra check is performed on the file system type on the remote computer on which IIS content is stored.

If the user on the Windows Vista client clicks Cancel in the error message dialog box, a DELETE request is sent to the computer that is running IIS.

Note A Windows XP WebDAV client does not send the lock token. Therefore, you do not experience this issue when you upload files from a computer that is running Windows XP.

For more information about opportunistic locks, visit the following Microsoft Developer Network (MSDN) Web site: For more information about how to configure opportunistic locking in Windows, click the following article number to view the article in the Microsoft Knowledge Base: