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STATUS_HOST_UNREACHABLE
The transport cannot reach the destination host
These statuses describe transport endpoint and connection state. For STATUS_HOST_UNREACHABLE, they can appear below higher-level file sharing, DFS, redirector, RPC, or networking code before the error is translated to Win32 or Winsock form.
This indicates reachability failure at the host/path level. The destination protocol or port is not the immediate issue if the host itself cannot be reached.
For STATUS_HOST_UNREACHABLE, for diagnostics, capture the endpoint address, address family, connection object, local and remote close/reset events, timeout, route, ICMP condition when available, and the higher-level component that issued the transport request.
What to inspect
- Check routing table, gateway, interface state, and VPN compartment.
- Compare with STATUS_PORT_UNREACHABLE for service-specific failures.
- Use packet capture or ICMP diagnostics when allowed.
References for STATUS_HOST_UNREACHABLE
- Microsoft Open Specifications: NTSTATUS values
- Microsoft: Windows Sockets error codes
- Microsoft Open Specifications: DFS client product behavior
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