HRESULT 0xC00D10C3 (NS_E_CHANGING

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Description:

Cannot change the proxy bypass flag if the proxy setting is not set to custom.%0

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NS_E_CHANGING_PROXY_EXCEPTIONLIST	NS_E_CHANGING_PROXY_PROTOCOL_NOT_FOUND

NS_E_CHANGING_PROXYBYPASS

Diagnosing NS_E_CHANGING_PROXYBYPASS in Player settings or the playback graph

NS_E_CHANGING_PROXYBYPASS (0xC00D10C3) is returned when the caller changed the bypass-local flag outside custom proxy mode.

Separate Network-object configuration, graph capabilities, graphics presentation, stream selection and COM ownership before changing playback content. Record what the Player had already completed because later retries often replace the original evidence. The specific rejected condition is the caller changed the bypass-local flag outside custom proxy mode.

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: selected protocol, proxy mode, bypass flag, target host classification and effective proxy route. The controlled comparison for it is: set custom mode and repeat against one short-name intranet host while tracing whether the proxy is contacted.

Closest distinction: The exception-list HRESULT is about named patterns; this one is about the local-address bypass switch.

State to capture before changing settings

Capture	Why it matters for it
Object or resource	selected protocol, proxy mode, bypass flag, target host classification and effective proxy route
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

Start from the original call and log 0xC00D10C3 together with its object and operation phase.
Collect selected protocol, proxy mode, bypass flag, target host classification and effective proxy route before changing the machine.
Use this single-variable test: set custom mode and repeat against one short-name intranet host while tracing whether the proxy is contacted.
repeat on a fresh object if the original predates a configuration, device or resource change.
validate the expected next operation, not just initial open or object creation.

Reading the next state

Retest outcome	Interpretation
Same this result 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 this result.
A later HRESULT appears	The rejected condition — the caller changed the bypass-local flag outside custom proxy mode — 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

assuming localhost, short names and private IP ranges are classified identically.
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

Retain before-and-after evidence for it so object recreation or content replacement is not mistaken for random retry success.

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