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STATUS_LPC_INVALID_CONNECTION_USAGE
The native port handle has the wrong role for the operation
Connection ports accept or establish channels, while communication ports carry messages after a connection is created. Native APIs validate these roles. Using the server connection handle for ordinary request traffic, replying through the wrong endpoint, or mixing handles from different connections can produce this failure.
The numeric handle alone does not reveal the logical role expected by application code. Store connection, server-communication, and client-communication handles in distinct objects, and invalidate them independently during teardown so a reconnect cannot accidentally reuse stale state.
What to inspect
- Log the native API, expected port role, handle value, connection ID, and process that created each handle.
- Trace the accept/connect result that produced the communication endpoint used by the failing call.
- Do not share one untyped handle field among listener, client, and accepted connection objects.
- Verify that reply messages return through the same communication relationship as their requests.
References
- Microsoft Open Specifications: NTSTATUS values
- System Informer PHNT: native LPC definitions
- ReactOS source: LPC implementation
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