Error message when you try to browse a DFS namespace from DFS the Management Tool: "An item with the same key has already been added"

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Article ID: 961652 - View products that this article applies to.
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SYMPTOMS

On a Windows Server 2008-based computer, when you try to browse a DFS namespace from the DFS Management Tool, the operation may fail. Additionally, you receive the following error message:
An item with the same key has already been added.
When this issue occurs, event 14547 is logged in the event log:

Log Name: System
Source: Microsoft-Windows-DfsSvc
Event ID: 14547
User: N/A
Computer: computer name
Description: A Distributed File System (DFS) folder was created with conflicting descriptions. This can occur if two administrators on different namespace servers create conflicting folder structures at approximately the same time. Namespace: \\domainname\public1 DFS folder path: test2\.DFSFolderLink DFS folder 1: link-017c585e-18bc-4412-bd11-15bb1f982e32 DFS folder 2: link-3ab25a17-d094-4979-8b66-e1c59e553d36

This event means that on the namespace \\domianname\public1, two DFS folders were created that have the name "test2."

The DFS folder 1 identification information is link-017c585e-18bc-4412-bd11-15bb1f982e32.

The DFS folder 2 identification information is link-3ab25a17-d094-4979-8b66-e1c59e553d36.

This issue occurs when two administrators on different namespace servers create a DFS folder that has the same name. In this case, you have to determine which folder you want to delete.

RESOLUTION

To resolve this issue, follow these steps:
  1. On the server that holds the primary domain controller (PDC) role, start Active Directory Service Interfaces (ADSI) Editor. To do this, click Start, click Run, and then type Adsiedit.msc.
  2. In ADSI Editor, connect to the default naming context.
  3. Under the domain name, expand CN=System, expand CN=DFS-Configurations, and then expand the DFS Namespace that is specified in the event log.
  4. Double-click the DFS Namespace. This time, you will see the DFS folders that are listed in the event log in the right pane of the ADSI Editor. These folders are distinguished by their GUIDs in the following format:
    link-GUID

    Examples:
    link-017c585e-18bc-4412-bd11-15bb1f982e32
    link-3ab25a17-d094-4979-8b66-e1c59e553d36
  5. Delete one of the folders.
  6. If this issue still exists, restart the DFS service on the DFS member server. Then, try to access the DFS namespace from the DFS management Tool.

STATUS

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

Properties

Article ID: 961652 - Last Review: January 22, 2009 - Revision: 1.0
APPLIES TO
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 Standard without Hyper-V
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
Keywords: 
kbtshoot kbsurveynew kbprb KB961652

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