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WININET_E_NO_CALLBACK
WININET_E_NO_CALLBACK is a WinINet HRESULT. It means that the operation requires a status callback but no callback function is registered for the relevant Internet handle.
What to check for WININET_E_NO_CALLBACK
- Register a valid status callback before starting the asynchronous operation that requires it.
- Keep callback-related state alive until all associated requests have completed or been cancelled.
- Avoid mixing an asynchronous handle configuration with code that assumes all operations complete synchronously.
Diagnostic interpretation
This result has the HRESULT value 0x80072EF9. AllStat records the condition as “No status callback was supplied”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the wininet / callback operation.
- Reproduce this result with the smallest valid input and note whether the result changes with identity, architecture, service state, or target object.
Retry and recovery
Retry this result only when the owning API documents a transient state or after the condition described as “No status callback was supplied” has changed.
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