Applies to ONTAP 9 NTFS security style Issue NFS clients encounters Invalid argument and Protocol not supported when attempting to mount a volume The volume is NTFS security style The specific version...Applies to ONTAP 9 NTFS security style Issue NFS clients encounters Invalid argument and Protocol not supported when attempting to mount a volume The volume is NTFS security style The specific version of NFS is enabled on the NFS server settings SMB clients are able to access the volume without issue The SVM-level ntfs-unix-security-ops setting is set to ignore