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NS_E_PROXY_DNS_TIMEOUT
What NS_E_PROXY_DNS_TIMEOUT means at its owning API
When this result (0xC00D2EF0) appears, the first blocked transition is proxy-server name resolution exceeded its allowed time. In practice, the failing streaming stage must be reconstructed from the same URL, stream, object instance and call sequence.
A Windows Media streaming request crosses name resolution, proxy selection, protocol negotiation, authentication, session creation and packet delivery. WMSP and related protocols maintain session state, so a valid TCP connection alone does not establish a usable media session.
Protocol-preserving retest
- Log
0xC00D2EF0, this result, the exact operation and the first failure time. - Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed before retrying.
- Perform one isolated test: repeat once with the same proxy explicitly configured and once with a direct connection, preserving the media URL and authentication identity.
- Repeat through the same API and protocol path; a different player or local-copy test is useful only as a comparison, not as proof that the stage is fixed.
What completed, and what did not
before the reported boundary, earlier setup may have succeeded, but proxy-server name resolution exceeded its allowed time was not completed. This is why logs should preserve both the last successful call and this result.
For a targeted comparison, repeat once with the same proxy explicitly configured and once with a direct connection, preserving the media URL and authentication identity. This isolates the disputed precondition without changing the media identity or unrelated machine settings before retrying.
Network and protocol evidence
| Capture | Why it matters |
|---|---|
| Owning call | Record the API method, object identity, thread or callback and timestamp for the failed operation. |
| Values to record | Original media URL, selected proxy source, proxy host and port, DNS result, authentication challenge, proxy response status and origin response if one was received. |
| Object instance | Note when the reader, writer, graph, URL object, streaming session or metadata provider was created; stale state can reproduce it after configuration has changed. |
| Comparison case | Use one known-good resource that exercises the same streaming path while changing only the rejected precondition. |
Misleading actions
- Changing the origin server while also changing proxy mode, which prevents attribution to the proxy boundary.
- Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the original failure.
Nearby results are not interchangeable
Main distinction: the proxy name failed to resolve; server DNS timeout concerns the media-origin host.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_CANNOT_CONNECT_TO_PROXY | The proxy address was resolved but a connection could not be established |
NS_E_SERVER_DNS_TIMEOUT | Media-server name resolution exceeded its allowed time |
NS_E_CLOSED_ON_SUSPEND | the media session was deliberately closed during system suspend or shutdown |
Technical references
- Windows Media HTTP Streaming Protocol overview
- Receiving a WMSP response
- Windows Media proxy interaction
- Windows media streaming protocol relationships
- Microsoft HRESULT registry
Retain the post-fix trace so a later pipeline result is not mistaken for recurrence of this boundary.
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