HRESULT 0xC00D4291 (MF_E_OFFLINE_MODE): meaning and diagnosis

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Description:

The requested URL is not available in offline mode.%0

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MF_E_NET_SESSION_INVALID	MF_E_NET_UDP_BLOCKED

MF_E_OFFLINE_MODE

Read this as a state transition

MF_E_OFFLINE_MODE (0xC00D4291) is a failure result from Windows Media Foundation. The generated section above already contains the platform message; the useful extra information is that this result isolates the current network configuration forbids fetching the requested URL because the client is operating offline.

The producer is the network source before DNS, proxy, or HTTP work is attempted, so diagnosis should begin with that object and its state rather than with a broad reinstall or an unrelated codec change. A representative occurrence is a URL is valid and reachable, but the application or platform property store explicitly requests offline behavior.

Read the call sequence as a timeline. First, the application reaches the network source before DNS, proxy, or HTTP work is attempted. Next, the component evaluates the current network configuration forbids fetching the requested URL because the client is operating offline. Only after the MF_E_OFFLINE_MODE checkpoint can a wrapper, user interface, or fallback path emit a less specific message.

Record before the object changes

Exact request: method name, all identifiers, units, flags, stream number, requested action, and MF_E_OFFLINE_MODE.
Object state: the URL, offline setting, network-cost or connectivity state, source-resolver properties, and whether a local cached copy exists.
Correlation for MF_E_OFFLINE_MODE: callback cookie, object generation, URL or file identity, device identity, and timestamps from the same attempt.
Underlying cause: the first Win32, COM, network, driver, policy, or component error reported before 0xC00D4291.

Test one hypothesis at a time

Use one controlled experiment: switch only the documented offline setting and repeat the identical URL resolution. A useful MF_E_OFFLINE_MODE comparison changes exactly that variable; changing content, account, proxy, device, components, and version together makes attribution impossible.

Outcome	Interpretation
The same checkpoint now succeeds	The changed condition belongs to the producing boundary for `MF_E_OFFLINE_MODE`.
A more specific earlier HRESULT appears	Preserve it; `MF_E_OFFLINE_MODE` was probably a wrapper or terminal state.
The operation advances and fails later	The `MF_E_OFFLINE_MODE` condition is fixed even though the complete workflow still has another defect.
No behavior changes	Restore the `MF_E_OFFLINE_MODE` baseline and test another documented prerequisite instead of stacking workarounds.

Do not merge these HRESULTs

Related code	Why it is not interchangeable
`MF_E_NET_REQUIRE_INPUT`	Internal; Entry cannot complete operation without input; compare this boundary specifically with `MF_E_OFFLINE_MODE`.
`MF_E_NET_REQUIRE_ASYNC`	Internal; Async op is required; compare this boundary specifically with `MF_E_OFFLINE_MODE`.
`MF_E_NETWORK_RESOURCE_FAILURE`	An attempt to acquire a network resource failed; compare this boundary specifically with `MF_E_OFFLINE_MODE`.

The important distinction is this: MF_E_NETWORK_RESOURCE_FAILURE means an attempted acquisition failed after network work began. For MF_E_OFFLINE_MODE, searching only for the visible English message collapses different states; the constant and 0xC00D4291 retain the boundary.

Confirm the correction

Apply the narrow remedy: restore online mode or use a verified local resource; changing codecs or credentials will not override offline policy. Then discard stale media objects, pending callbacks, cached provider sessions, or installer state as appropriate and rerun the exact request that originally returned MF_E_OFFLINE_MODE.

A confirmed MF_E_OFFLINE_MODE repair produces the requested stream, attribute, state transition, license decision, store callback, or setup result. Suppressing MF_E_OFFLINE_MODE, broadly enabling legacy controls, or falling back to unrelated content is not proof of repair.

References

Media Foundation architecture — reference used for the MF_E_OFFLINE_MODE checkpoint.
Media Foundation error codes — reference used for the MF_E_OFFLINE_MODE checkpoint.
Proxy support for network sources — reference used for the MF_E_OFFLINE_MODE checkpoint.
Creating a media source from a URL — reference used for the MF_E_OFFLINE_MODE checkpoint.

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