macOS kernel return 43 (KERN_RPC_SERVER

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The Mach RPC target server terminated before sending a successful reply.

Could be also:
Constant	Type	OS
ippStsWaterfall	Intel Ipp Status	Any
EIDRM	errno	Linux
EPROTONOSUPPORT	errno	Mac
ENOCSI	errno	Solaris
PANIC_STACK_SWITCH	BugCheck Code	Windows

Previous	Next
KERN_SEMAPHORE_DESTROYED	KERN_RPC_TERMINATE_ORPHAN

KERN_RPC_SERVER_TERMINATED

A missing reply from a terminated server

KERN_RPC_SERVER_TERMINATED reports that a Mach RPC target stopped before it replied successfully. It is not a generic application-protocol error: Mach RPC is built on messages and MIG-generated procedural interfaces, so the failure belongs to the service endpoint and reply path.

Do not assume that the requested action did not start. For an operation with side effects, retry safety depends on the service contract and on whether the client can determine that the server processed the request before termination.

What to inspect

Collect the target service identity, request identifier, and reply-port information.
Correlate server termination, crash, restart, or shutdown diagnostics from the same time window.
Determine whether the operation is idempotent or has a durable request identifier.
Check whether a new service instance is allowed to replay the request.

References

Looking for a different code? Search another status or error code.