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NS_E_CHANGING_PROXY_PROTOCOL_NOT_FOUND
Diagnosing NS_E_CHANGING_PROXY_PROTOCOL_NOT_FOUND in Player settings or the playback graph
NS_E_CHANGING_PROXY_PROTOCOL_NOT_FOUND (0xC00D10C4) is returned when the proxy API was given a protocol name for which the Player has no network configuration entry.
Separate Network-object configuration, graph capabilities, graphics presentation, stream selection and COM ownership before changing playback content. Here, the decisive boundary is the proxy API was given a protocol name for which the Player has no network configuration entry. 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: the exact protocol token, case, supportedProtocol count and installed Player version. The controlled comparison for it is: enumerate supported protocols and repeat with an exact returned name such as HTTP where available.
Closest distinction: NS_E_WMP_INVALID_PROTOCOL occurs when opening media with an unsupported transport, not while selecting a proxy settings record.
State to capture before changing settings
| Capture | Why it matters for it |
|---|---|
| Object or resource | the exact protocol token, case, supportedProtocol count and installed Player version |
| 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
0xC00D10C4, this result, the exact method or command and the first failure time. - Preserve the exact protocol token, case, supportedProtocol count and installed Player version.
- Perform one isolated comparison: enumerate supported protocols and repeat with an exact returned name such as HTTP where available.
- 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 — the proxy API was given a protocol name for which the Player has no network configuration entry — 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
- inventing a proxy configuration for a file extension rather than a transport protocol.
- 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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