HRESULT 0x8001000F (RPC_E_INVALID_DATA): meaning and diagnosis

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Description:

COM received invalid call data; the faulty data can originate at the client or server.

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RPC_E_SERVER_CANTUNMARSHAL_DATA	RPC_E_INVALID_PARAMETER

RPC_E_INVALID_DATA

RPC_E_INVALID_DATA is a COM RPC data-integrity error. The runtime detected invalid data but cannot attribute it solely to the caller or the server from this HRESULT alone.

How to narrow it down

Capture the method, interface ID, client version, server version, and the first related HRESULT on both sides.
Verify proxy-stub and type-library compatibility before investigating higher-level payload values.
Review custom marshaling code for invalid sizes, stale pointers, and version assumptions.

Focus first on the call boundary; application-level input validation happens after COM has successfully delivered a valid call.

Microsoft: COM error codes

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