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NS_E_PROTOCOL_MISMATCH
What NS_E_PROTOCOL_MISMATCH means
NS_E_PROTOCOL_MISMATCH (0xC00D0012) means the client and server do not share a usable media protocol or protocol version for this session.
Evidence to preserve
Record the client and server versions, protocols offered by each side, selected URL scheme, and the negotiation response that eliminated the remaining choices.
Interpretation
A reachable server can still fail here after connection because compatibility is decided by protocol negotiation rather than basic network access.
Recovery and verification
Use a protocol/version supported at both ends or upgrade/reconfigure the incompatible endpoint. Retest without simultaneously changing media content.
Technical references
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