errno 148 (EHOSTUNREACH): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: No route to host

Could be also:
Constant	Type	OS
ERROR_PATH_BUSY	Win32 error	Windows
KERNEL_STACK_LOCKED_AT_EXIT	BugCheck Code	Windows

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EHOSTDOWN	EALREADY

EHOSTUNREACH

Host-specific reachability failed

EHOSTUNREACH reports an attempted transport-provider operation to an unreachable host. Solaris troubleshooting material notes that route or intermediate gateway status can make it difficult to distinguish a down host from a down network, which is why the exact route and returned status matter.

The error is not an application-port refusal. ECONNREFUSED means the connection request was actively refused; EHOSTUNREACH says the network path cannot deliver the operation to the host under the current reachability information.

Host-path checks

Capture the resolved destination address, route, next hop, and address family rather than only the hostname.
Check gateway and switching policy, neighbor-resolution state, and whether other hosts on the same destination network remain reachable.
Compare with ENETUNREACH events to determine whether failures cluster by host or by network prefix.

References

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