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STATUS_PORT_CLOSED
The ALPC communication endpoint is no longer usable
ALPC ports represent connection, communication, and server endpoints with lifetimes independent of an individual request. This failure indicates that the endpoint needed for the current operation has closed, usually because the peer exited, disconnected, closed its handle, or teardown won a race with message dispatch.
A closed port is not repaired by resending the same native call on the same handle. The application must decide whether its higher-level service supports reconnection, whether in-flight requests should fail, and whether handles or shared sections attached to those requests require separate cleanup.
What to inspect
- Capture which side closed first and whether process termination, service restart, or explicit disconnect preceded the failure.
- Validate the handle generation so a stale port handle is not confused with a newly established connection.
- Fail or reconcile every outstanding message associated with the closed channel.
- Reconnect through the documented service protocol instead of reusing the closed communication port.
References
- Microsoft Open Specifications: NTSTATUS values
- System Informer PHNT: native ALPC definitions
- Microsoft Windows SDK metadata: ntstatus.h
- ReactOS source: LPC implementation
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