| Previous | Next |
| NS_E_UNKNOWN_PROTOCOL | NS_E_INTERNAL_SERVER_ERROR |
NS_E_REDIRECT_TO_PROXY
NS_E_REDIRECT_TO_PROXY in a format, graph or streaming trace
For this HRESULT (0xC00D2EE1) the decisive boundary is the connection procedure has selected a proxy as the next request target. Diagnose the redirect to proxy streaming checkpoint directly and avoid inferring the cause only from the visible playback symptom.
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. In the case of this result, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT.
Nearby results are not interchangeable
Main distinction: the code identifies one network or protocol checkpoint and should not be collapsed into a generic connectivity failure.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_UNKNOWN_PROTOCOL | Compare the owning API and first rejected value; it belongs to a neighboring checkpoint, not automatically to the same cause as this result. |
NS_E_INTERNAL_SERVER_ERROR | Use object state and operation order to decide which code is authoritative when both appear in one trace. |
NS_E_BAD_REQUEST | Retain this result separately if it appears only after the condition has cleared. |
Failure anatomy
The stage is reached when the connection procedure has selected a proxy as the next request target. The caller must not assume that the next filter, packet, session or metadata state exists after this result.
Use repeat once with the same proxy explicitly configured and once with a direct connection, preserving the media URL and authentication identity as the negative control. A later HRESULT means this checkpoint was cleared and the new result belongs to a different stage.
Protocol-preserving retest
- Log
0xC00D2EE1, it, the exact operation and the first failure time. - Preserve original media URL, selected proxy source, proxy host and port, DNS result, authentication challenge, proxy response status and origin response if one was received.
- Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed.
- 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.
- Confirm the expected next state and retain any new HRESULT as a separate downstream result.
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 media URL, selected proxy source, proxy host and port, DNS result, authentication challenge, proxy response status and origin response if one was received. |
| 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
- changing the origin server while also changing proxy mode, which prevents attribution to the proxy boundary.
- Do not erase the first occurrence by repeatedly retrying; callbacks and reconnects can replace the useful state with a later wrapper error.
- Do not publish credentials, protected-content material or complete private URLs. Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the stage.
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 crosses this checkpoint; success through a different player or cached copy is merely supporting evidence.
Looking for a different code? Search another status or error code.