What does HRESULT 0xC00D2F0B (NS_E_PUSH_CANNOTCONNECT) mean?

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Description:

Unable to establish a connection to the server. Ensure Windows Media Services is started and the HTTP Server control protocol is properly enabled.%0

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NS_E_PACKETSINK_UNKNOWN_FEC_STREAM	NS_E_INCOMPATIBLE_PUSH_SERVER

NS_E_PUSH_CANNOTCONNECT

What `NS_E_PUSH_CANNOTCONNECT` means at its owning API

When this result (0xC00D2F0B) appears, the first blocked transition is a push publisher cannot establish the encoder-to-server control connection. In practice, the push cannotconnect streaming checkpoint must be reconstructed from the same URL, stream, object generation and call sequence.

Protocol-preserving retest

Log 0xC00D2F0B, this result, the exact operation and the first failure time.
Preserve original URL, chosen protocol, proxy mode, resolved endpoints, connection and response timing, authentication state, session identifier and first socket or protocol result.
Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed.
Perform one isolated test: test TCP establishment to the exact selected endpoint and compare timestamps with the configured connection deadline.
Confirm the expected next state and retain any new HRESULT as a separate downstream result.

What completed, and what did not

Before the stage, earlier setup may have succeeded, but a push publisher cannot establish the encoder-to-server control connection was not completed. This is why logs should preserve both the last successful call and this result.

The targeted comparison is test TCP establishment to the exact selected endpoint and compare timestamps with the configured connection deadline. It changes the disputed precondition without changing the media identity or unrelated machine settings.

Network and protocol evidence

Capture	Why it matters
Owning call	Record the API method, object identity, thread or callback and timestamp for the stage.
Decisive values	original URL, chosen protocol, proxy mode, resolved endpoints, connection and response timing, authentication state, session identifier and first socket or protocol result.
Object generation	Note when the reader, writer, graph, URL object, streaming session or metadata provider was created; stale state can reproduce it after configuration has changed.
First nested result	Keep the earliest codec, COM, socket, DNS, parser or provider status before it; later UI messages are less specific.
Comparison case	Use one known-good resource that exercises the same stage while changing only the rejected precondition.

Reading the next network state

Retest result	Interpretation
The identical call still returns the code	The values governing the stage are unchanged, or the caller is still using an older object generation.
A fresh object succeeds	Lifetime or cached state contributed to it; correct object recreation instead of applying a machine-wide workaround.
The call advances to another HRESULT	the stage boundary was cleared. Diagnose the new code at its own format, graph, URL, network or metadata stage.
Only one resource fails	The evidence favors content, URL, publishing point, stream, attribute or object-specific state rather than a global outage.

Misleading actions

treating every streaming HRESULT as generic packet loss without separating DNS, connect, response and session phases.

Nearby results are not interchangeable

Nearby HRESULT	How to compare it
`NS_E_SESSION_INVALID`	Compare the owning API and first rejected value; it belongs to a neighboring checkpoint, not automatically to the same cause as it.
`NS_E_PACKETSINK_UNKNOWN_FEC_STREAM`	Use object state and operation order to decide which code is authoritative when both appear in one trace.
`NS_E_INCOMPATIBLE_PUSH_SERVER`	Retain it separately if it appears only after the condition has cleared.

Technical references

Retain the post-fix trace so a later pipeline result is not mistaken for recurrence of this boundary.

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