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NS_E_DRM_INVALID_SESSION
The first reliable fact
The condition encoded by 0xC00D28A9 is not generic playback failure; it is that the WMDRM-ND message refers to a nonexistent, expired or mismatched protocol session. Diagnosis of NS_E_DRM_INVALID_SESSION 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, correlate session identifier, peer identity and message sequence. 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_INVALID_SESSION from neighboring Windows Media errors.
The transaction to reconstruct
The object graph behind NS_E_DRM_INVALID_SESSION includes device certificate and serial number, registration-database entry, approval flag, validation timestamp, network session, protocol message and transcrypt policy. A NS_E_DRM_INVALID_SESSION trace should retain the exact WMDRM-ND message type, device identifier, certificate chain, registration state, round-trip timing and the first protocol HRESULT.
This evidence matters because the rejected condition is specifically that the WMDRM-ND message refers to a nonexistent, expired or mismatched protocol session.
A controlled before/after test
A useful failure model for NS_E_DRM_INVALID_SESSION links cause and recovery: the WMDRM-ND message refers to a nonexistent, expired or mismatched protocol session. Verify that model when you correlate session identifier, peer identity and message sequence, then make the smallest change needed to discard stale messages and create a new session for the same registered device. For NS_E_DRM_INVALID_SESSION, use a known-good counterpart only as a control; do not replace the failing artifact before its identifiers and hashes are recorded.
Incident data
| Field | Value for NS_E_DRM_INVALID_SESSION |
|---|---|
| Owner | operation, API/callback, object or session identifier, and component/device version associated with NS_E_DRM_INVALID_SESSION |
| Direct check | correlate session identifier, peer identity and message sequence |
| Policy input | requested action plus the exact license, certificate, profile, output or registration property evaluated by NS_E_DRM_INVALID_SESSION |
| Temporal state | trusted/system time, validity interval, request sequence and retry number when they influence NS_E_DRM_INVALID_SESSION |
| Lower result | the earliest store, network, cryptographic, driver or provider status preceding the final NS_E_DRM_INVALID_SESSION wrapper |
Do not merge these failures
| Result | Why it points elsewhere |
|---|---|
NS_E_DRM_MUST_REVALIDATE | the receiver registration exists but its proximity validation is stale or no longer acceptable |
NS_E_DRM_INVALID_PROXIMITY_RESPONSE | the receiver returned a proximity response that fails parsing or cryptographic verification |
NS_E_DRM_DEVICE_NOT_OPEN | the application attempted protected transfer before opening the validated registered device |
What the result does not prove
For NS_E_DRM_INVALID_SESSION, the established fact is that the WMDRM-ND message refers to a nonexistent, expired or mismatched protocol session. For NS_E_DRM_INVALID_SESSION, 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_INVALID_SESSION as the first specific result. The object and operation attached to NS_E_DRM_INVALID_SESSION are usually more diagnostic than a later cleanup or user-interface summary.
Reproduce at the owning layer
- Preserve
NS_E_DRM_INVALID_SESSIONand0xC00D28A9before cleanup, fallback or another media item changes the context. - Apply the narrow correction for
NS_E_DRM_INVALID_SESSION: discard stale messages and create a new session for the same registered device. - Associate
NS_E_DRM_INVALID_SESSIONwith its current WMDRM for Network Devices object and the requested action. - Run the direct check for
NS_E_DRM_INVALID_SESSION: correlate session identifier, peer identity and message sequence. - Compare the failure with a known-good case that changes only the property named by this condition: the WMDRM-ND message refers to a nonexistent, expired or mismatched protocol session.
- Repeat the same action with the same content/device identity and verify that
NS_E_DRM_INVALID_SESSIONis not replaced by another policy or trust failure.
Restore the required state
Repair the owner of the check: discard stale messages and create a new session for the same registered device. For NS_E_DRM_INVALID_SESSION, success means that the same requested action is accepted after that precise state change, not merely that another file or device happens to work.
- While investigating NS_E_DRM_INVALID_SESSION, keep this restriction: 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_INVALID_SESSION; that bypasses the decision instead of correcting its input. - Retain one failing artifact and one corrected artifact so the resolution of
NS_E_DRM_INVALID_SESSIONcan be regression-tested.
Keep a diagnostic fixture
For the final NS_E_DRM_INVALID_SESSION 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_INVALID_SESSION 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_INVALID_SESSION
- Windows Media DRM 10 for Network Devices — lists the security and state transitions used to interpret NS_E_DRM_INVALID_SESSION.
- Device registration — defines the platform objects used when diagnosing NS_E_DRM_INVALID_SESSION.
- Using the WMDRM-ND protocol — documents the protocol or API boundary behind NS_E_DRM_INVALID_SESSION.
- MS-DRMND protocol specification — provides the normative workflow relevant to NS_E_DRM_INVALID_SESSION.
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