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STATUS_ILLEGAL_FUNCTION
The named-pipe operation was issued on the wrong pipe end
Record the operation issued to the pipe handle and its current mode and state. A handle can be valid while a particular control or I/O function is not supported for that pipe endpoint.
Some pipe operations are valid only on the server end. This status points to a wrong-handle problem rather than malformed data in the pipe message.
What to inspect
- Confirm whether the handle came from CreateNamedPipe or CreateFile.
- Do not call server-only operations on the client end.
- Log handle ownership when a pipe handle is passed between threads or processes.
References for STATUS_ILLEGAL_FUNCTION
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