Explorer view or mapped network drive does not open SharePoint library when using load balancer on web front ends

Article ID: 2388749 - View products that this article applies to.
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SYMPTOMS

When using a load balancer to distribute client requests across multiple web front ends, the Explorer View functionality may fail to operate properly. The failure may be represented to the client as repeated prompts for authentication, or the client may receive a generic "Page cannot be displayed" error message.

This problem may appear inconsistent across clients depending on the configuration of the client computer. This is because the Explorer View feature relies on IE Web Folder Behaviors to provide it’s functionality. The IE Web Folders Behavior can leverage either of two possible protocols to produce the Explorer View experience:
  1. The Windows Web Client Service which uses the standard WebDAV protocol.
  2. The FPRPC protocol as provide by the Web Extender Client components.

Clients which do not have the Web Extender Client components installed will experience this problem, while clients that do have these components installed may be immune. The Web Extender Client components were originally shipped as part of the Office suite and within 32-bit versions of the Microsoft Windows operating systems. Starting with Windows Vista, these components were no longer provided with the operating system. 

CAUSE

The SharePoint Explorer View feature requires certain standard WebDAV verbs to provide its expected functionality. Any load balancer need to be configured to forward these verbs to the SharePoint Web Front End servers in order for the Explorer View feature to work correctly.

RESOLUTION

Configure the load balancer to forward all of the following verbs:

GET, POST, OPTIONS, HEAD, MKCOL, PUT, PROPFIND, PROPPATCH, DELETE, MOVE, COPY, GETLIB, LOCK, UNLOCK

Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Properties

Article ID: 2388749 - Last Review: September 22, 2010 - Revision: 6.0
APPLIES TO
  • Microsoft Office SharePoint Portal Server 2003
  • Microsoft Windows SharePoint Services 2.0
  • Microsoft Windows SharePoint Services 3.0
  • Microsoft SharePoint Foundation 2010
  • Microsoft SharePoint Server 2010
  • Microsoft Office SharePoint Server 2007
Keywords: 
KB2388749

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