NTSTATUS 0xC0020063 (RPC_NT_INVALID_ASYNC

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Description:

The asynchronous RPC handle exists, but the requested operation is invalid for its current call state.

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RPC_NT_INVALID_ASYNC_HANDLE	RPC_NT_PROXY_ACCESS_DENIED

RPC_NT_INVALID_ASYNC_CALL

Invalid operation for the asynchronous RPC call state

RPC_NT_INVALID_ASYNC_CALL belongs to the Windows RPC runtime NTSTATUS facility. For RPC_NT_INVALID_ASYNC_CALL, mS-RPCE extends the DCE/RPC model: generated stubs marshal parameters, the runtime binds to an endpoint and protocol sequence, and security or transport failures can be returned as RPC facility status values.

This status is about async call state, not merely handle syntax. The handle may be initialized, but the requested action does not match the current lifecycle of the asynchronous call.

Examples include completing a call twice, querying status before a call is associated, cancelling after cleanup, or mixing client-side and server-side async operations incorrectly.

What to check for RPC_NT_INVALID_ASYNC_CALL

Trace every transition: initialize, start call, notification, complete, cancel, free.
Separate invalid handle lifetime bugs from invalid call-state transitions.
Review code that handles exceptions; error cleanup often performs a second completion or cancellation.

References for RPC_NT_INVALID_ASYNC_CALL

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