After starting iSCSI Failover on secondary node this node goes automatically to active mode (it means that VIP is available at this moment on both nodes). This sitution happens when your auxiliary connections between nodes are broken. Before starting iSCSI Failover service on secondary node please ping all IP addresses used in iSCSI Failover on Primary node in order to check connectivity between nodes (this step please do under console CTRL+ALT+T on secondary node).