If you need to remove the mapping of null users to windows user or group in NetApp, it can be done with the following steps

Step 1: Set the privilege level to advanced:

# set -privilege advanced

Step 2: Configure the restrict anonymous setting:

# vserver cifs options modify -vserver vserver_name -restrict-anonymous {no-restriction|no-enumeration|no-access}

Step 3: Verify that the option is set to the desired value:

vserver cifs options show -vserver vserver_name

Step 4: Return to the admin privilege level:

set -privilege admin