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STATUS_CLUSTER_NODE_UNREACHABLE
The target node is unreachable to the cluster
STATUS_CLUSTER_NODE_UNREACHABLE concerns reachability, which is narrower than membership and different from a simple ICMP test. A server can answer a ping yet still be unusable to failover clustering because the relevant cluster network/interface path, service, authentication, or firewall path is unavailable.
Compare the node inventory with the cluster network and network-interface inventory. The goal is to identify the broken relationship: node-to-network, node-to-interface, or management/cluster communication. Use the timestamps from both sides before treating the incident as a node failure.
What to verify
- Inspect
Get-ClusterNetworkInterfacefor the affected node and network. - Check whether the node is Up, Down, or Paused rather than inferring state from one connectivity probe.
- Collect cluster logs from reachable nodes before making topology changes.
References
- Microsoft: Get-ClusterNetwork
- Microsoft: Get-ClusterNetworkInterface
- Microsoft: Failover Clustering overview
- Microsoft: Get-ClusterLog
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