HRESULT 0xC00D28AC (NS_E_DRM_UNSUPPORTED_PROTOCOL

Status / error code:

Category:

Constant name:

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Operating System:

Description:

Unsupported WMDRM-ND protocol version.%0

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NS_E_DRM_DEVICE_ALREADY_REGISTERED	NS_E_DRM_UNSUPPORTED_ACTION

NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION

Interpret the security decision

At 0xC00D28AC, NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION records that the transmitter and receiver do not share a supported WMDRM-ND protocol version. Diagnosis of NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION therefore starts in WMDRM for Network Devices, the layer responsible for the transmitter/receiver protocol that registers a network playback device, approves it, validates proximity, opens a protected session and transcrypts licensed content for that receiver.

Before changing the machine, record both advertised version values from the negotiation. The standard AllStat text is already shown above; this custom section concentrates on the object state and the evidence needed to separate NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION from neighboring Windows Media errors.

From HRESULT to cause

Preserve NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION and 0xC00D28AC before cleanup, fallback or another media item changes the context.
Run the direct check for NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION: record both advertised version values from the negotiation.
Compare the failure with a known-good case that changes only the property named by this condition: the transmitter and receiver do not share a supported WMDRM-ND protocol version.
Apply the narrow correction for NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION: update one endpoint or negotiate a mutually supported version.
Associate NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION with its current WMDRM for Network Devices object and the requested action.
Repeat the same action with the same content/device identity and verify that NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION is not replaced by another policy or trust failure.

Do not lose object identity

For NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION, the important objects are device certificate and serial number, registration-database entry, approval flag, validation timestamp, network session, protocol message and transcrypt policy. Evidence for NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION should correlate the exact WMDRM-ND message type, device identifier, certificate chain, registration state, round-trip timing and the first protocol HRESULT.

A later generic error must not replace this evidence: the original condition remains that the transmitter and receiver do not share a supported WMDRM-ND protocol version.

How the operation should advance

A useful failure model for NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION links cause and recovery: the transmitter and receiver do not share a supported WMDRM-ND protocol version. Verify that model when you record both advertised version values from the negotiation, then make the smallest change needed to update one endpoint or negotiate a mutually supported version. The NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION model is suitable for a regression fixture because its expected state change is observable without weakening the DRM policy.

Values to compare

Field	Value for `NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION`
Owner	operation, API/callback, object or session identifier, and component/device version associated with NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION
Direct check	record both advertised version values from the negotiation
Policy input	requested action plus the exact license, certificate, profile, output or registration property evaluated by NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION
Temporal state	trusted/system time, validity interval, request sequence and retry number when they influence NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION
Lower result	the earliest store, network, cryptographic, driver or provider status preceding the final NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION wrapper

Distinguish from nearby results

Result	Why it points elsewhere
`NS_E_DRM_DEVICE_NOT_OPEN`	the application attempted protected transfer before opening the validated registered device
`NS_E_DRM_DEVICE_ALREADY_REGISTERED`	registration attempts to create a duplicate record for the same device identity
`NS_E_DRM_UNSUPPORTED_ACTION`	the WMDRM-ND endpoint or policy does not implement the requested operation

Keep the scope narrow

For NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION, the established fact is that the transmitter and receiver do not share a supported WMDRM-ND protocol version. For NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION, that fact does not independently establish damaged media bytes, a missing decoder, a generally broken network, or invalid rights for every other action.

If the Player, encoder, setup program or device layer later emits a broader error, retain NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION as the first specific result. The object and operation attached to NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION are usually more diagnostic than a later cleanup or user-interface summary.

Fix and verify

The appropriate operational response is to update one endpoint or negotiate a mutually supported version. For NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION, success means that the same requested action is accepted after that precise state change, not merely that another file or device happens to work.

NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION: Do not delete the complete device-registration database before preserving the failing device record and certificate chain; that removes the distinction between registration, approval, validation and session failures.
Do not alter trusted time, revocation enforcement, certificate validation or output policy merely to suppress NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION; that bypasses the decision instead of correcting its input.
Retain one failing artifact and one corrected artifact so the resolution of NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION can be regression-tested.

Completion criterion

For the final NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION test, keep the content KID or file hash, requested action, user/account, device identity and output route unchanged wherever they apply. The NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION case is resolved only when the operation completes without this HRESULT and without a substitute failure from a neighboring license, trust, session or policy check.

Technical references for `NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION`

Windows Media DRM 10 for Network Devices — documents the protocol or API boundary behind NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION.
Device registration — provides the normative workflow relevant to NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION.
Using the WMDRM-ND protocol — lists the security and state transitions used to interpret NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION.
MS-DRMND protocol specification — defines the platform objects used when diagnosing NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION.

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