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NS_E_DRM_BAD_REQUEST
Read the code before the dialog
The producer of 0xC00D28B0 has determined that a WMDRM-ND request has invalid framing, fields or message semantics. NS_E_DRM_BAD_REQUEST comes from WMDRM for Network Devices, whose state machine implements 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.
The shortest path to a defensible diagnosis is to preserve raw message length/type and parser failure offset without exposing protected secrets. 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_BAD_REQUEST from neighboring Windows Media errors.
Correlate the owner and the policy
A complete NS_E_DRM_BAD_REQUEST incident ties together device certificate and serial number, registration-database entry, approval flag, validation timestamp, network session, protocol message and transcrypt policy; the minimum correlation set for NS_E_DRM_BAD_REQUEST is 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 a WMDRM-ND request has invalid framing, fields or message semantics.
Why the first HRESULT matters
When documenting NS_E_DRM_BAD_REQUEST, state the rejected input and the expected successor state. The rejected input is demonstrated when you preserve raw message length/type and parser failure offset without exposing protected secrets; the successor becomes reachable after you correct the sender implementation and regenerate the request. The NS_E_DRM_BAD_REQUEST comparison should preserve content and device identity so success cannot be attributed to testing a different asset.
Minimum evidence set
| Field | Value for NS_E_DRM_BAD_REQUEST |
|---|---|
| Lower result | the earliest store, network, cryptographic, driver or provider status preceding the final NS_E_DRM_BAD_REQUEST wrapper |
| Owner | operation, API/callback, object or session identifier, and component/device version associated with NS_E_DRM_BAD_REQUEST |
| Direct check | preserve raw message length/type and parser failure offset without exposing protected secrets |
| Policy input | requested action plus the exact license, certificate, profile, output or registration property evaluated by NS_E_DRM_BAD_REQUEST |
| Temporal state | trusted/system time, validity interval, request sequence and retry number when they influence NS_E_DRM_BAD_REQUEST |
Contrast with related results
| Result | Why it points elsewhere |
|---|---|
NS_E_DRM_CERTIFICATE_SECURITY_LEVEL_INADEQUATE | the peer certificate is valid but its security level is below the operation’s minimum |
NS_E_DRM_UNABLE_TO_OPEN_PORT | the application cannot bind the port used for WMDRM-ND proximity messages |
NS_E_DRM_INVALID_CRL | the certificate revocation list used by WMDRM-ND is malformed, corrupt or unverifiable |
The final dialog can be broader
For NS_E_DRM_BAD_REQUEST, the established fact is that a WMDRM-ND request has invalid framing, fields or message semantics. For NS_E_DRM_BAD_REQUEST, 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_BAD_REQUEST as the first specific result. The object and operation attached to NS_E_DRM_BAD_REQUEST are usually more diagnostic than a later cleanup or user-interface summary.
A controlled reproduction
- Preserve
NS_E_DRM_BAD_REQUESTand0xC00D28B0before cleanup, fallback or another media item changes the context. - Run the direct check for
NS_E_DRM_BAD_REQUEST: preserve raw message length/type and parser failure offset without exposing protected secrets. - Compare the failure with a known-good case that changes only the property named by this condition: a WMDRM-ND request has invalid framing, fields or message semantics.
- Apply the narrow correction for
NS_E_DRM_BAD_REQUEST: correct the sender implementation and regenerate the request. - Associate
NS_E_DRM_BAD_REQUESTwith 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_BAD_REQUESTis not replaced by another policy or trust failure.
Recovery at the right layer
The appropriate operational response is to correct the sender implementation and regenerate the request. For NS_E_DRM_BAD_REQUEST, success means that the same requested action is accepted after that precise state change, not merely that another file or device happens to work.
- Evidence for
NS_E_DRM_BAD_REQUESTis easy to destroy; 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_BAD_REQUEST; that bypasses the decision instead of correcting its input. - Retain one failing artifact and one corrected artifact so the resolution of
NS_E_DRM_BAD_REQUESTcan be regression-tested.
Re-test the original case
For the final NS_E_DRM_BAD_REQUEST 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_BAD_REQUEST 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_BAD_REQUEST
- Windows Media DRM 10 for Network Devices — provides the normative workflow relevant to NS_E_DRM_BAD_REQUEST.
- Device registration — lists the security and state transitions used to interpret NS_E_DRM_BAD_REQUEST.
- Using the WMDRM-ND protocol — defines the platform objects used when diagnosing NS_E_DRM_BAD_REQUEST.
- MS-DRMND protocol specification — documents the protocol or API boundary behind NS_E_DRM_BAD_REQUEST.
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