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NS_E_PROXY_SOURCE_ACCESSDENIED
NS_E_PROXY_SOURCE_ACCESSDENIED: diagnosis and verification
As a controlled comparison, NS_E_PROXY_SOURCE_ACCESSDENIED (0xC00D2EF7) means the proxy could not authenticate itself successfully to the media origin.
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.
Network and protocol evidence
| Capture | Why it matters |
|---|---|
| Owning call | Record the API method, object identity, thread or callback and timestamp for that stage. |
| 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. |
| Comparison case | Use one known-good resource that exercises the same streaming path while changing only the rejected precondition. |
Failure anatomy
the reported boundary is reached when the proxy could not authenticate itself successfully to the media origin. The caller must not assume that the next filter, packet, session or metadata state exists after it.
Repeat once with the same proxy explicitly configured and once with a direct connection, preserving the media URL and authentication identity. If the same operation then returns a different HRESULT, diagnose that later result separately.
Nearby results are not interchangeable
Main distinction: the proxy accepted the client but could not authenticate to the origin server.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_PLAYLIST_ENTRY_HAS_CHANGED | A command still refers to a playlist entry generation that has already changed |
NS_E_PROXY_ACCESSDENIED | the proxy rejected the client authentication or authorization context |
NS_E_NETWORK_SINK_WRITE | The streaming sink failed while writing media data to the network connection |
Protocol-preserving retest
- Log
0xC00D2EF7, the exact operation and the first failure time. - 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 failed operation is fixed.
Misleading actions
- Publishing passwords in logs or assuming every authorization failure is caused by an incorrect password before retrying.
- Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the original failure.
Technical references
- Windows Media HTTP Streaming Protocol overview
- Receiving a WMSP response
- Windows Media proxy interaction
- Windows media streaming protocol relationships
- Microsoft HRESULT registry
Treat it as resolved only when the same API path succeeds at this stage; success through a different player or cached copy is merely supporting evidence.
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