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Article: Q270580
Product(s): Microsoft Windows NT
Version(s): winnt:4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Operating System(s): 
Keyword(s): kberrmsg kbnetwork kbtool
Last Modified: 11-JUN-2002

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The information in this article applies to:

- Microsoft Windows NT Server versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4, 4.0 SP5, 4.0 SP6, 4.0 SP6a 
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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:

  Q256986 Description of the Microsoft Windows Registry

SYMPTOMS
========

When you try to re-create a DFS share, you may receive the following error
message:

  Unable to create a mapping

However, you are still able to create new DFS shares after you receive the error
message.

CAUSE
=====

This issue can occur if the DFS share is damaged. Note that when this occurs,
you may not be able to delete the damaged share.

RESOLUTION
==========

To resolve this issue:

1. Log on to the Windows NT Server-based computer that hosts the DFS root as an
  administrator.

2. Click Start, point to Settings, and then click Control Panel.

3. Double-click Services.

4. Click DFS Service, and then click Startup.

5. Click Disabled, and then click OK.

6. Quit all programs, and then restart the server.

7. Log on to the server as an administrator.

8. Delete the damaged DFS share.

9. Repeat steps 2-5, but enable the DFS service in step 5.

10. Restart the server, and then log on as an administrator.

11. Re-create the DFS share.

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

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.

DFS share information is recorded in the following registry key:

  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DFSDriver\LocalVolumes

If needed, you can delete orphaned entries.

Additional query words:

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Keywords          : kberrmsg kbnetwork kbtool 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400sp6 kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400sp3 kbWinNTS400sp2 kbWinNTS400sp1 kbWinNTS400search kbWinNTS400
Version           : winnt:4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Issue type        : kbprb

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Q270580: "Unable to Create Mapping" Error Message Re-creating DFS Share