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NS_E_CHANGING_PROXY_EXCEPTIONLIST
Diagnosing NS_E_CHANGING_PROXY_EXCEPTIONLIST in Player settings or the playback graph
NS_E_CHANGING_PROXY_EXCEPTIONLIST (0xC00D10C2) is returned when the proxy bypass list was modified while the protocol was not using custom proxy configuration.
Separate Network-object configuration, graph capabilities, graphics presentation, stream selection and COM ownership before changing playback content. The actionable checkpoint is the proxy bypass list was modified while the protocol was not using custom proxy configuration. Although this result may appear as “cannot play” or “cannot save,” it belongs to a specific object state that should be diagnosed directly.
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: proxy mode, raw exception list, delimiter rules, host being opened and bypass result. The controlled comparison for it is: select custom mode and test one exact hostname with and without a single bypass entry.
Closest distinction: NS_E_CHANGING_PROXYBYPASS concerns the global bypass-local flag rather than the explicit exception list.
State to capture before changing settings
| Capture | Why it matters for it |
|---|---|
| Object or resource | proxy mode, raw exception list, delimiter rules, host being opened and bypass result |
| 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
- Capture the resource identity and proxy mode, raw exception list, delimiter rules, host being opened and bypass result.
- verify that the caller uses the current Playlist, Media, Network, graph, device or DRM object generation.
- Run the narrow experiment: select custom mode and test one exact hostname with and without a single bypass entry.
- Do not mix the result experiment with a codec pack, Player reset or broad registry cleanup.
- After this result, treat a new specific HRESULT as evidence that this boundary was cleared.
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 — the proxy bypass list was modified while the protocol was not using custom proxy configuration — 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
- copying browser bypass syntax without checking the WMP Network object contract.
- 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
The result fix is demonstrated by the same Player path succeeding with the same resource, not by another application opening it.
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