errno 64 (ENONET): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: a legacy networked subsystem reports that the machine is not on its network.

Could be also:
Constant	Type	OS
ERROR_NETNAME_DELETED	Win32 error	Windows
EHOSTDOWN	errno	Mac
ENONET	errno	Solaris
TARGET_MDL_TOO_SMALL	BugCheck Code	Windows

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ENOSR	EHOSTDOWN

ENONET

ENONET is a legacy Linux errno name for “Machine is not on the network”. It is not the usual result for a modern IP route lookup failure. Modern socket paths more commonly report ENETUNREACH, EHOSTUNREACH, ENETDOWN, or protocol-specific errors.

When ENONET appears, identify the subsystem that chose this older errno vocabulary: a compatibility filesystem, driver, RPC layer, or userspace library. Check network namespace membership, mounted remote resources, and service registration state before treating it as a simple routing problem.

Compare with

ENETDOWN: the network is down.
ENETUNREACH: no route to the network.
EHOSTUNREACH: no route to the host.
ENOLINK: a lower link was severed.

Linux errno(3) · Linux UAPI errno definitions

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