The Windows Failover Clustering service is reporting an unknown status for this node.
For more details, view the component's node_state property in the PDW Admin Console or query the sys.dm_pdw_component_health_status DMV.
To diagnose this issue:
1) On the Management node, use a Windows administrator account to view the Cluster Events in the Failover Cluster Manager.
2) Use the sys.dm_pdw_os_events_logs DMV to check for relevant failures in the Windows Event Log for the node.
To resolve this issue, contact Microsoft support and provide them with the alert name and details. Microsoft Support will help you to understand the failure and help you to bring the node back online or into a healthy state.