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NS_E_REQUIRE_STREAMING_CLIENT
The resource requires streaming-session semantics
NS_E_REQUIRE_STREAMING_CLIENT (0xC00D2EF4) means the requested content cannot be consumed through the current access path because the resource requires a streaming media client and its session/protocol behavior.
Confirm how the resource was opened
Record the original URL, chosen protocol, client component, and whether the caller attempted ordinary file/HTTP retrieval instead of creating the streaming session expected by the publishing point. A successful TCP connection or HTTP response does not prove that the required media session exists.
Targeted retest
Open the same resource through a supported Windows Media streaming client/path while keeping the endpoint and credentials unchanged. If session creation then proceeds and a different protocol or authentication error appears, use that later HRESULT. Downloading a local copy may prove the bytes are reachable, but it does not satisfy this streaming-client requirement.
Technical references
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