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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 this result 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.
From HRESULT to cause
- Preserve this result and
0xC00D28ACbefore cleanup, fallback or another media item changes the context. - Run the direct check for it: 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 it: update one endpoint or negotiate a mutually supported version.
- Associate this result 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 it is not replaced by another policy or trust failure.
Do not lose object identity
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 it 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 it 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 result model is suitable for a regression fixture because its expected state change is observable without weakening the DRM policy.
Values to compare
| Field | Value |
|---|---|
| Owner | operation, API/callback, object or session identifier, and component/device version associated with it |
| 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 it |
| Temporal state | trusted/system time, validity interval, request sequence and retry number when they influence it |
| Lower result | the earliest store, network, cryptographic, driver or provider status preceding the final it 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
The established fact is that the transmitter and receiver do not share a supported WMDRM-ND 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 it as the first specific result. The object and operation attached to it 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. Success means that the same requested action is accepted after that precise state change, not merely that another file or device happens to work.
- It: 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 it; that bypasses the decision instead of correcting its input.
- Retain one failing artifact and one corrected artifact so the resolution of it can be regression-tested.
Completion criterion
For the final it test, keep the content KID or file hash, requested action, user/account, device identity and output route unchanged wherever they apply.
Technical references
- Windows Media DRM 10 for Network Devices — documents the protocol or API boundary behind it.
- Device registration — provides the normative workflow relevant to it.
- Using the WMDRM-ND protocol — lists the security and state transitions used to interpret it.
- MS-DRMND protocol specification — defines the platform objects used when diagnosing it.
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