What does Windows error code 5926 (ERROR_CLUSTER_INVALID_IPV6_NETWORK) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: ERROR_CLUSTER_INVALID_IPV6_NETWORK the cluster network is not valid for an IPv6 Address resource, or it does not match the configured address.

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ERROR_CLUSTER_NO_QUORUM	ERROR_CLUSTER_INVALID_IPV6_TUNNEL_NETWORK

ERROR_CLUSTER_INVALID_IPV6_NETWORK

ERROR_CLUSTER_INVALID_IPV6_NETWORK means the configured IPv6 address does not match a valid cluster network for the IP Address resource. Address prefix, route, adapter, or resource dependency settings may be wrong.

Compare the resource address and prefix with the cluster network discovered from the node interfaces. A syntactically valid IPv6 address can still be unusable when no cluster network represents its intended subnet or route.

What to check

Compare the IPv6 address and prefix length with the cluster network that should host it.
Verify IPv6 is enabled consistently on the participating adapters and VLANs.
Inspect the IP Address resource dependencies and current owner node before changing the address.

Get-ClusterNetwork
Get-ClusterNetworkInterface
Get-NetIPAddress -AddressFamily IPv6

Microsoft: FailoverClusters PowerShell module

Microsoft: Validate hardware for a failover cluster

Microsoft: Get-ClusterLog

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