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STATUS_LPC_REQUESTS_NOT_ALLOWED
The port no longer accepts new request traffic
A port can remain represented by a handle while its protocol state prevents new requests. Shutdown, disconnect, rejection of new clients, or a port mode intended only for replies and datagrams can all make request submission invalid. This differs from a malformed message because the endpoint state is the deciding factor.
Retry logic should first establish whether the service is draining, restarting, or permanently rejecting requests. Repeated sends on the same endpoint can amplify shutdown races and obscure the first transition that disabled request acceptance.
What to inspect
- Record the port state transition and the operation that disabled new requests.
- Check service lifecycle events, connection rejection, and peer process termination around the first failure.
- Stop queueing new application work before closing or draining the native port.
- Reconnect only after obtaining a new communication endpoint and resetting per-connection message IDs.
References
- Microsoft Open Specifications: NTSTATUS values
- System Informer PHNT: native LPC definitions
- Microsoft Windows SDK metadata: ntstatus.h
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