• Environment is a Windows Domain with 160+ Clients, several DCs. No WINS. DNS working.
  • Fileserver is a Windows Server 2012 R2, patched regularly, SMB shares, proper NTFS and share permissions.
  • Clients are Windows 7 x64 machines. Clients get drive mappings via Group Policies.


Random users receive the error message "Z:\ refers to a location that is unavailable. ..." when they want to create a new folder. Accessing the folder over Windows explorer works. Also renaming of files and folders works. Creating new folders and files works also in Windows Explorer, when the location in question is accessed over UNC paths. Creating new files and folders also works when accessing the drive mapping via a program such as DoubleCommander. Also saving files from Office applications to the network drive works.

Our measurements included:

  • deleting the drive mapping and creating it again
  • verifying the correct order in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order
  • rebooting server and client
  • uninstalling antivirus software from client (none on server)
  • accessing the drive from other profiles from the same PC (same error on some, works for others)
  • creating folder from cmd (works)
  • accessing the drive from the same user on another PC (works)

I appreciate any advice on how to track this down further.


Access based enumeration enabled on the share?

Just resolved an extremely similar sounding issue. Client was Windows 10 in our case, but the same issue and resolution.


  • When posting a link please also include the main points in your answer in case the link is ever broken. – D34DM347 Oct 27 '16 at 11:45
  • Although the rights are set as proposed in the linked blog post, I was able to create a new folder after disabling ABE. Therefore I mark this answer as most helpful. Thank you! – foax Oct 27 '16 at 12:12

protected by Community Oct 23 '17 at 14:43

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