Fix ERROR_CLUSTER_NETINTERFACE_NOT_FOUND (0x13B7)

Quick answer

Run Get-ClusterNetworkInterface to list current interfaces, then use Add-ClusterNetworkInterface to re-add the missing NIC if it still exists on the node. If the NIC is gone, remove the stale cluster network object with Remove-ClusterNetwork and let the cluster re-create it.

This error pops up when a Failover Cluster node has a network adapter that was renamed, disabled, or uninstalled after the cluster was created. The cluster keeps a record of the old interface name and UID. When the node reboots or the cluster service restarts, it looks for that interface and can't find it. You'll see the event logged, and cluster validation may report the network as unhealthy. This often happens after a NIC teaming driver update or when someone renames a physical adapter in Network Connections without updating the cluster.

Don't panic. You usually don't need to remove the node or rebuild the cluster. The fixes below are safe to run live, but you'll want to test on a non-production node first if you can.

Step-by-step fixes

Fix 1: Re-add the missing network interface

Open Failover Cluster Manager on any node. Or run PowerShell as Administrator.
Check current interfaces:
```
Get-ClusterNetworkInterface
```
Look for the node and network that's missing. For example, you might see Node1 - Cluster but not Node2 - Cluster.
Confirm the physical adapter still exists on the node. Run Get-NetAdapter on the affected node and note the Name and InterfaceDescription.
If the adapter is there, re-add it to the cluster:
```
Add-ClusterNetworkInterface -Name "Node2 - Cluster" -Node Node2 -Network "Cluster"
```
Replace the strings with your actual node name and cluster network name. You can find network names with Get-ClusterNetwork.
After running, verify with Get-ClusterNetworkInterface again. You should see the interface listed. Then run Test-Cluster to confirm network health.

Expected outcome: The error event stops appearing, and cluster validation shows no network interface problems.

Fix 2: Remove stale network object if NIC is gone

If the adapter itself was uninstalled or permanently renamed, you can't re-add it. Instead, tell the cluster to forget the old network.

Identify the cluster network that's broken. Run:
```
Get-ClusterNetwork
```
Look for networks with no node interfaces or marked as Unavailable.
Remove that network from the cluster:
```
Remove-ClusterNetwork -Name "OldNetworkName"
```
Replace OldNetworkName with the exact network name.
Now the cluster should automatically re-create the network when it detects the remaining adapters. If not, restart the cluster service on all nodes:
```
Restart-Service ClusSvc
```
Run this on each node, one at a time, to avoid downtime.
Check Get-ClusterNetwork again. You should see the network reappear with the correct node interfaces.

Expected outcome: The missing interface error disappears, and the cluster shows the network as healthy.

Fix 3: Rename a NIC back to match cluster config

If the adapter still exists but was renamed, you can simply rename it back to what the cluster expects. The cluster stores the original adapter name (like 'Ethernet' or 'Cluster NIC').

On the affected node, open Network Connections (or use Rename-NetAdapter).
Rename the adapter to exactly what the cluster thinks it is. You can find the expected name in the error event details or by running Get-ClusterNetworkInterface on a working node—compare the naming convention.
Restart the cluster service on that node: Restart-Service ClusSvc. The interface should bind correctly.

Expected outcome: The cluster picks up the renamed adapter automatically.

Alternative fixes if the above don't work

Run cluster validation to see the full picture. Use Test-Cluster -Include "Network". It may suggest other issues like duplicate IPs or missing VLANs.
Check for duplicate network names in the cluster. If two networks have the same name, the cluster gets confused. Rename one via Set-ClusterNetwork -Name "Cluster_1".
Force a network re-detection by doing a full node restart. Sometimes the cluster caches the stale state. Rebooting clears it, but only after trying the re-add steps.
If you're on a multi-node cluster and one node is persistently broken, consider evicting and re-adding the node. This is heavier but works when the node's cluster configuration is corrupted beyond simple fixes. Remove-ClusterNode then Add-ClusterNode.

Prevention tips

The real fix is to never rename or remove a NIC without telling the cluster first. If you must rename an adapter, follow this order:

Drain the node and pause it in Failover Cluster Manager.
Rename the adapter in Windows.
Resume the node. The cluster will detect the new name and update automatically.

Also, always use static names for cluster NICs. Don't let DHCP or scripts change them. Set the Name property on the adapter via Set-NetAdapter -Name "Ethernet" -NewName "Cluster_Node1" before creating the cluster, and stick with it.

If you're using NIC teaming, avoid mixing different teaming modes across nodes. The cluster expects consistent interface names and speeds. I've seen this error pop up on Windows Server 2016 and 2019 after a driver update that changed the interface GUID. In that case, the only reliable fix was to remove and re-add the network object (Fix 2).

Finally, keep your cluster validation report handy. Run Test-Cluster after any hardware or driver change. That 5-minute check will save you an hour of digging through event logs later.