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NS_E_CHANGING_PROXY_NAME
Diagnosing NS_E_CHANGING_PROXY_NAME in Player settings or the playback graph
NS_E_CHANGING_PROXY_NAME (0xC00D10C0) is returned when code attempted to set a proxy host while the protocol proxy mode is not custom.
Separate Network-object configuration, graph capabilities, graphics presentation, stream selection and COM ownership before changing playback content. Here, the decisive boundary is code attempted to set a proxy host while the protocol proxy mode is not custom. This result is most useful when treated as a Player checkpoint, not as a recommendation to reinstall everything.
Configuration or graph boundary
AllStat already supplies the standard user-facing description for it; this custom block instead isolates the additional technical boundary. Earlier success in file lookup, network connection, parser creation or graph construction does not prove that the later the operation is valid.
Case-specific checkpoint: protocol string, getProxySettings result, current proxy name and order of setter calls. The controlled comparison for it is: set the protocol proxy mode to custom, then assign a syntactically valid host and read it back.
Closest distinction: NS_E_WMP_PROXY_NOT_FOUND is a runtime resolution failure after a proxy has been selected.
State to capture before changing settings
| Capture | Why it matters for it |
|---|---|
| Object or resource | protocol string, getProxySettings result, current proxy name and order of setter calls |
| State snapshot | Record the Player openState/playState or operation phase, object identity and exact timestamp when this result was returned. |
| First lower result | Keep the earliest Win32, Winsock, COM, parser, codec, DRM or device result that appears before this result. |
| Comparison record | Use one known-good case that follows the same API, protocol and component path while changing only the rejected precondition. |
One-variable verification
- Record
0xC00D10C0, this result, the exact method or command and the first failure time. - Preserve protocol string, getProxySettings result, current proxy name and order of setter calls.
- Perform one isolated comparison: set the protocol proxy mode to custom, then assign a syntactically valid host and read it back.
- Repeat the original Player path after it and keep any new HRESULT as a downstream result.
- confirm the expected state transition rather than only disappearance of the dialog.
Reading the next state
| Retest outcome | Interpretation |
|---|---|
| Same it on the same object | The governing state or value is unchanged, or the caller is reusing an object created before the relevant change. |
| Fresh object succeeds | Lifetime, cached configuration or stale playlist/graph state contributed to it. |
| A later HRESULT appears | The rejected condition — code attempted to set a proxy host while the protocol proxy mode is not custom — was cleared for it; diagnose the new code at its own layer. |
| Only one item or endpoint fails for it | The evidence favors resource-specific data, rights, routing or device state rather than a global Player failure. |
Actions that obscure the cause
- editing system-wide proxy settings when the embedded Player object owns separate settings.
- Do not discard the first occurrence by repeatedly invoking Play, open, save or retry; later events can replace its original state.
- do not publish credentials, private URLs, license material or complete protected-content headers; retain only redacted identifiers, lengths, hashes and protocol fields.
Technical references
- IWMPNetwork interface
- Network object
- Supported protocols and file types
- DirectShow filter graph
- Microsoft HRESULT registry
Close it only when the original operation crosses this boundary and reaches the expected next Player state.
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