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Unable to perform write operations on an export mounted on a Windows machine

Last Updated:

Applies to

  • ONTAP 9
  • NFS on Windows machine


  • Access denied on trying write operations using NFS on a Windows client machine.
  • For example, access denied seen when a new folder is created. 



  • As a workaround, the UID and GID of users can be squashed on the windows machine to a user having sufficient access.
NOTE: After using the below steps, every user on the Windows client machine will start sending the same NFS credentials which could be a concern when multiple users are accessing data. Engage client-vendor to understand the full implications of these registry modifications.
  • Start Registry Editor on the client machine.
  • Locate HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ClientForNFS\CurrentVersion\Default.
  • Create two DWORD values namely AnonymousUid and AnonymousGid.
  • Set these values to the UID and GID you would like this NFS client to use.
  • Restart the client machine.


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