HRESULT 0x80010009 (RPC_E_INVALID

Status / error code:

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Constant name:

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Description:

COM received a malformed marshaled parameter packet for a remote or cross-apartment call.

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RPC_E_CLIENT_DIED	RPC_E_CANTTRANSMIT_CALL

RPC_E_INVALID_DATAPACKET

RPC_E_INVALID_DATAPACKET means that COM rejected malformed marshaled call data before a normal method invocation could proceed. It points to a proxy or marshaling compatibility problem, not an ordinary application-level validation error.

What to inspect

Verify that client and server use compatible interface definitions and proxy-stub registrations.
For custom marshaling, validate the serialized layout, length fields, and version handling.
Check that deployment did not mix binaries built from different IDL or type-library versions.

Do not try to reinterpret the packet in application code; correct the interface or marshaler that produced it.

Microsoft: COM documentation

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