During the replace node operation, the UI wrongly shows that the replace operation failed because the data rebuild operation failed
If the private network is down and SSH connection is lost between the cluster node where the NetBackup Flex Scale Appliance GUI is running and the replacement node, the UI wrongly shows that the replace operation failed even though the network connectivity was restored between the nodes and the node was replaced successfully. (IA-27044)
Workaround
Contact Veritas Support to resolve this issue if the cluster is in an inconsistent state.