NTSTATUS 0xC000002F (STATUS_PORT_MESSAGE_TOO

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A native port message exceeds the maximum size accepted by the port.

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STATUS_INVALID_PORT_ATTRIBUTES	STATUS_INVALID_PARAMETER_MIX

STATUS_PORT_MESSAGE_TOO_LONG

The message is larger than the port allows

These statuses come from the native NT port message path used by low-level Windows IPC. For STATUS_PORT_MESSAGE_TOO_LONG, they are about port object attributes, connection handles, and message size constraints, not about TCP ports.

Native port messaging has a maximum message size. This status means the caller reached the port path, but the request or reply buffer was too large for the port contract.

For STATUS_PORT_MESSAGE_TOO_LONG, when debugging this class of status, keep the native API that failed, the port handle type, the connection state, the object attributes used to create or connect the port, and the message length that was sent.

What to inspect

Log the message length and maximum expected by the port.
Split large payloads or move bulk data out of the port message.
Check whether a wrong structure version made the message unexpectedly large.

References for STATUS_PORT_MESSAGE_TOO_LONG

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