What does HRESULT 0xC00D426B (MF_E_NET_REQUIRE_NETWORK) mean?

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The requested media operation requires network access.

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MF_E_NET_READ	MF_E_NET_REQUIRE_ASYNC

MF_E_NET_REQUIRE_NETWORK

MF_E_NET_REQUIRE_NETWORK indicates that the operation cannot complete without reaching a network source. It is not a media-format diagnosis.

Verify that the URL is reachable from the same security context as the player or service.
Check offline-mode, captive portal, proxy, and firewall state before retrying.
Confirm that the application did not attempt to resolve or open the source after its network stack was intentionally shut down.