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NS_E_REG_FLUSH_FAILURE
The failing WMDRM boundary
0xC00D2798 maps to NS_E_REG_FLUSH_FAILURE. Read it as a result from local license store, secure store and machine binding: DRM state could not be durably flushed to the registry. Keeping the “reg flush failure” boundary intact for it prevents a later playback message from hiding the original DRM failure.
The built-in message summarizes the user-visible outcome, while the symbolic phrase “reg flush failure” preserves the exact WMDRM boundary for diagnosis. For this code, the proof step is to capture registry path, account, ACL and underlying flush error.
Place in the DRM workflow
The workflow around this result matters: a license is stored in the protected local license store after acquisition; a store failure is therefore distinct from a server refusing to issue a license. In addition, machine-bound state cannot be diagnosed safely by copying store files between computers or by deleting the original before evidence is preserved.
State to capture before retry
Capture the first occurrence before retry or teardown changes state. The smallest useful record contains:
- Code-specific proof: capture registry path, account, ACL and underlying flush error.
- Protected identity: first store API call that failed: open, enumerate, save, close or query.
- Operation state: license identifier and content key identifier (KID).
- Persistence or transport: store path, file generation, access result and underlying system error.
- Security context: hardware identity and the last hardware or operating-system change.
- Correlation point: checkpoint, secure-store and registry persistence sequence.
Prefer IDs, hashes, sizes, and timestamps. Never log keys, passwords, licenses, or decrypted media.
A useful investigation order
- Locate the earliest API return, callback or event containing this result and
0xC00D2798. - Identify the exact content, license, store, device or migration object generation involved in “reg flush failure”.
- Determine whether “reg flush failure” occurred before network exchange, during response validation, while enforcing policy, or while committing protected state.
- Perform the code-specific check: capture registry path, account, ACL and underlying flush error.
- Make one narrow correction — restore registry persistence and repeat the transaction from a known state — and repeat the same producing operation.
Narrow remediation
The corrective direction is to restore registry persistence and repeat the transaction from a known state. Preserve the original content/header, store or migration material for it until the operation succeeds and survives a fresh application object or required restart.
Representative case: A policy/ACL change lets values be set but prevents durable flush.
What not to do first
- Avoid deleting or resetting DRM state before recording hashes, timestamps and the first store error. That changes evidence without demonstrating why this result was produced.
- Avoid copying a protected license store from another computer as a repair. That shortcut can create a second store, identity or policy problem.
- Do not reduce this result to “DRM failed” in telemetry; retain the HRESULT, symbolic name, operation and object identity.
Nearby results with different meanings
| Result | Different boundary |
|---|---|
NS_E_DRM_CHECKPOINT_CORRUPT | The DRM checkpoint itself fails integrity or structure validation. |
NS_E_HDS_KEY_MISMATCH | The key protecting hardware-dependent DRM state does not match the stored data. |
NS_E_DRM_CHECKPOINT_MISMATCH | The DRM checkpoint does not match the protected data-store generation. |
Order the result event chain by timestamp; prefer the earliest specific result.
Verification after correction
After the repair, recreate the WMDRM object and run the smallest reproducer for it. Confirm that 0xC00D2798 no longer occurs, that the intended license action completes, and that no store, certificate, clock or migration warning replaces it.
Code-specific operational note
The symbolic phrase “reg flush failure” is the important search and telemetry key for it. Keep it beside the exact value 0xC00D2798; the official message “The requested action cannot be performed because a problem occurred with the Windows Media Digital Rights Management (DRM) components on your computer.” is useful to users, but it does not identify the producing API, object generation or protected identity on its own.
Technical references
- Licenses and the local license store — API and state rules relevant to this boundary.
- Enumerating licenses in the local store — platform documentation used to distinguish this result from adjacent results.
- DRM client interfaces — official Windows Media DRM context for it.
- Windows Media DRM error codes
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