HRESULT 0x80010001 (RPC_E_CALL_REJECTED): meaning and diagnosis

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Description:

A COM callee or message filter rejected the call because it could not process it at that time.

Could be also:
Constant	Type	OS
DBG_EXCEPTION_NOT_HANDLED	NTSTATUS	Windows

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E_UNEXPECTED	RPC_E_CALL_CANCELED

RPC_E_CALL_REJECTED

RPC_E_CALL_REJECTED means that a COM call was rejected by the callee or by COM call filtering. It commonly occurs when an apartment-threaded automation server is busy with a modal dialog, user edit, or another operation that temporarily cannot accept the call.

How to handle a rejected call

Confirm that the target application is not showing a modal dialog or waiting for user input.
For an automation client, use a bounded retry policy only where retrying the specific operation is safe.
An STA server must continue pumping its message queue while it is expected to receive COM calls.

A retry must not blindly repeat an operation that may already have changed data. Record the method, arguments, and server state before choosing a retry policy.

Microsoft: COM documentation

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