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ERROR_CLUSTER_IPADDR_IN_USE
A client access IP address conflicts with another host or resource. The conflict may be on the same subnet, a stale cluster resource, a duplicate static address, or an address still registered after an incomplete failover.
What to check
- Identify the current owner of the address before changing the cluster resource configuration.
- Inspect IP Address and Network Name resources, their dependencies, and the relevant DNS records.
- Collect a cluster log around the online attempt; it records the resource that detected the address conflict.
Get-ClusterResource | Where-Object ResourceType -eq "IP Address"Microsoft: Get-ClusterResource
Microsoft: Troubleshoot a cluster Network Name resource
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