macOS kernel return 47 (KERN_NODE_DOWN): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A remote Mach node was down or inaccessible to the requested operation.

Could be also:
Constant	Type	OS
ippStsRepetitiveSrcData	Intel Ipp Status	Any
EL3RST	errno	Linux
EAFNOSUPPORT	errno	Mac
ECANCELED	errno	Solaris
INSTRUCTION_BUS_ERROR	BugCheck Code	Windows

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KERN_NOT_SUPPORTED	KERN_NOT_WAITING

KERN_NODE_DOWN

Remote-node availability, not a local queue timeout

KERN_NODE_DOWN identifies a remote node that is down or inaccessible. It differs from KERN_OPERATION_TIMED_OUT, which is a local thread-oriented wait that expired, and from MACH_SEND_TIMED_OUT, which concerns admission to a local destination port queue.

The status belongs to older distributed-Mach semantics and low-level diagnostics. Preserve the endpoint and routing context before treating it as a generic network outage; the immediate failure may be in the Mach node relationship rather than an application socket connection.

What to inspect

Keep the remote-node identity or path used by the caller.
Determine whether the target had become unavailable, was never reachable, or was torn down during the request.
Collect companion IPC, reply, or service-lifecycle status.
Check whether the modern application actually uses a supported local service abstraction instead of distributed Mach facilities.

References

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