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NS_E_UNKNOWN_PROTOCOL
NS_E_UNKNOWN_PROTOCOL: network-stage diagnosis
NS_E_UNKNOWN_PROTOCOL (0xC00D2EE0) means the client has no usable handler for the URL scheme or negotiated streaming protocol.
Evidence to preserve
Record the original scheme, any protocol selected after negotiation/redirect, client protocol configuration and the first point at which no handler can be chosen.
Focused verification
Use a protocol that the same client is configured to handle for the same media endpoint. If that path starts, focus on protocol support or selection rather than the media payload.
Technical references
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