errno 112 (EHOSTDOWN): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: a socket operation failed because the destination host was down.

Could be also:
Constant	Type	OS
ERROR_DISK_FULL	Win32 error	Windows
EINPROGRESS	errno	Windows
SESSION4_INITIALIZATION_FAILED	BugCheck Code	Windows
SOFT_RESTART_FATAL_ERROR	BugCheck Code	Windows

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ECONNREFUSED	EHOSTUNREACH

EHOSTDOWN

EHOSTDOWN is a host-state result in the network error family. It is narrower than ENETUNREACH, which points at network reachability, and different from EHOSTUNREACH, which is usually a routing or neighbor reachability failure. EHOSTDOWN is about the destination host being considered down by the stack or by a protocol client.

In practice, the useful evidence often lives below the application syscall: neighbor discovery, ARP, routing, interface carrier state, remote filesystem logs, or a protocol-specific client such as CIFS/NFS. Retrying application requests without checking that lower state can only create noisy failures.

Distinguish from nearby errors

ENETDOWN: the local network interface or network is down.
ENETUNREACH: no usable route to the network.
EHOSTUNREACH: route exists, but the host cannot be reached.
ECONNREFUSED: the host responded, but refused the connection.

Linux ip(7) · Linux errno(3) · Linux UAPI errno definitions

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