Multiprotocol access in Nutanix Files allows both SMB and NFS clients to access the same share. This functionality requires a unified permissions model, which relies on mapping NFS user identities (UID/GID) to Windows user identities (SIDs). Nutanix Files uses Microsoft Active Directory (AD) as the central identity and authentication source to perform this mapping. If the file server has not been joined to an AD domain, the necessary infrastructure for identity mapping is absent. Consequently, the option to "Enable multiprotocol accounts for NFS clients" will not be available during share creation, as its primary prerequisite is not met.

B. The file server instance was only configured with SMB.

A file server can be deployed with both protocols enabled, yet the multiprotocol option for a specific share can still be unavailable if authentication prerequisites are not met.

C. The incorrect Files license has been applied.

Standard multiprotocol access is a core feature of Nutanix Files and is not gated by a specific license tier. Advanced features may require higher licenses, but not this fundamental capability.

D. NFS configured to use unmanaged authentication.

While using unmanaged authentication for NFS is incompatible with multiprotocol access, the root cause is the lack of an AD connection, which is required to enable the necessary managed authentication options in the first place.

1. Nutanix Files User Guide v4.4

Creating a Share or Export (Nutanix Files Console)

Section: "Multiprotocol Access". The documentation explicitly states as a prerequisite: "You must have Active Directory configured." This confirms that the absence of an AD connection prevents the configuration of multiprotocol access.

2. Nutanix University

Nutanix Unified Storage Administration (NCP-US) 6.5 Student Guide

Module 3: Nutanix Files

Lesson: "Configuring Nutanix Files". The courseware details that for multiprotocol access

Active Directory is mandatory as it serves as the lookup source for mapping user SIDs

UIDs

and GIDs

which is essential for unified permissions.

3. Nutanix Files Tech Note

Identity and Access Management

Section: "Multiprotocol". The document explains the architecture

stating that "For multiprotocol

Files uses AD as the name service provider to resolve the user mapping between Windows and Linux." This highlights the foundational role of AD in the feature's operation.