errno 67 (ENOLINK): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: a remote or link-oriented connection was severed below the caller.

Could be also:
Constant	Type	OS
ERROR_BAD_NET_NAME	Win32 error	Windows
EPROCLIM	errno	Mac
ENOLINK	errno	Solaris
NO_SUCH_PARTITION	BugCheck Code	Windows

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ENOLINK

ENOLINK means a link has been severed. In Linux diagnostics it is most useful for stacked, remote, or link-oriented subsystems where an operation depends on a lower connection that no longer exists. It should not be confused with a missing pathname component.

The right evidence is usually outside the immediate syscall arguments: mount logs, remote service state, transport resets, reconnect attempts, device removal, or protocol-specific session teardown. Retrying a single file operation may hide the real loss of the lower link.

Distinguish from

ENOENT: a path component does not exist.
ESTALE: a remote file handle is stale.
ECONNRESET: a peer reset an established connection.
EIO: a broader I/O failure without link-specific information.

POSIX errno.h · Linux errno(3) · Linux UAPI errno definitions

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