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ERROR_NETWORK_NOT_AVAILABLE
The required cluster network is unavailable
Failover Clustering represents networks and network interfaces as cluster objects. A resource or cluster operation can require a usable cluster network, and this error indicates that no currently available network satisfies that need.
This is not the same as an application TCP timeout. Inspect the cluster view of networks and node interfaces first. A physical link can appear up while cluster network role, subnet configuration, or node interface state makes the network unusable for the cluster operation.
What to inspect
- List cluster networks and network interfaces and compare their state across nodes.
- Check whether the required subnet exists on the current owner or possible-owner nodes.
- Correlate network adapter, VLAN, routing, and FailoverClustering events before moving the role to another node.
Get-ClusterNetwork | Format-Table Name, State, Role
Get-ClusterNetworkInterface | Format-Table Name, State, Node, NetworkReferences
- Microsoft Open Specifications: MS-CMRP glossary
- Microsoft: FailoverClusters PowerShell module
- Microsoft: Get-ClusterLog
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