Microsoft issued a hotfix over the holidays to deal with an issue where:
- You configure a failover cluster that has some computers that are running Windows Server 2008 R2.
- One cluster node is offline or is removed from the cluster.
- You try to rejoin the cluster node to the cluster after a while.
In this scenario, the cluster node cannot rejoin the cluster.
According to Microsoft, the cause is that:
When a cluster node tries to rejoin a cluster after it is restarted or removed from the cluster, the virtual IP address of the cluster node may be changed. However, other cluster nodes still use old route records in their route database. Therefore, the cluster node cannot rejoin the cluster.
A supported hotfix is available from Microsoft.