What does HRESULT 0xC00D2798 (NS_E_REG_FLUSH_FAILURE) mean?

NS_E_REG_FLUSH_FAILURE

What failed in WMDRM

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. Preserving the first NS_E_REG_FLUSH_FAILURE occurrence prevents a later playback message from hiding the original DRM failure.

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

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.

A useful investigation order

1. Locate the earliest API return, callback or event containing this result and 0xC00D2798.
2. Identify the exact content, license, store, device or migration object instance involved in “reg flush failure”.
3. Determine whether “reg flush failure” occurred before network exchange, during response validation, while enforcing policy, or while committing protected state.
4. Perform the code-specific check: capture registry path, account, ACL and underlying flush error.
5. Make one targeted change — restore registry persistence and repeat the transaction from a known state — and repeat the same producing operation.

Targeted fix

To correct this, restore registry persistence and repeat the transaction from a known state.

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.
• Avoid copying a protected license store from another computer as a repair.
• Do not reduce this result to “DRM failed” in telemetry; retain the HRESULT, symbolic name, operation and object identity.

Nearby results with different meanings

Verification after correction

After the repair, recreate the WMDRM object and run the smallest reproducer. 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 user-facing message “The requested action cannot be performed because a problem occurred with the Windows Media Digital Rights Management (DRM) components on your computer.” describes the visible condition but does not identify the producing API, object instance, or protected identity by itself.

Technical references

• Licenses and the local license store — API and state rules relevant to this result.
• Enumerating licenses in the local store — platform documentation used to distinguish this result from adjacent results.
• DRM client interfaces — official Windows Media DRM context.
• Windows Media DRM error codes