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ERROR_CLUSTER_NODE_UNREACHABLE
The node may still be powered on, but cluster traffic cannot reach it. Treat this as a connectivity or membership-health problem and distinguish it from a simple application-level connectivity failure.
What to check for ERROR_CLUSTER_NODE_UNREACHABLE
- Compare network interface state and cluster network membership on both sides of the communication path.
- Check firewall, routing, VLAN, NIC, and virtualization changes made near the first failure.
- Run validation and inspect cluster logs before changing heartbeat-related settings.
Get-ClusterNetwork; Get-ClusterNetworkInterfaceMicrosoft: Get-ClusterNetworkInterface
Where the result is returned
This result is Win32 system error 5051 (0x000013BB) from winerror.h. AllStat describes it as “The cluster node is not reachable.”
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