rebalance failure in windows fts system test

2018-04-03T22:57:55.843-07:00, ns_orchestrator:0:critical:message(ns_1@172.23.99.148) - Rebalance exited with reason {service_rebalance_failed,fts,

                              {rebalance_failed,

                               {service_error,

                                <<"nodes: sample, res: (*http.Response)(nil), urlUUID: monitor.UrlUUID{Url:\"http://172.23.99.150:8094\", UUID:\"f49df171bfbb7c30ff6c54880241020d\"}, kind: /api/stats, err: Get http://%40fts-cbauth:25ca1d25eb84fea64d02c0f315952677@172.23.99.150:8094/api/stats: dial tcp 172.23.99.150:8094: connectex: No connection could be made because the target machine actively refused it.">>}}}

2018-04-03T22:58:37.284-07:00, ns_cluster:5:info:message(ns_1@172.23.99.148) - Failed to add node 172.23.104.36:8091 to cluster. Prepare join failed. Node is already part of cluster.

2018-04-03T23:00:08.585-07:00, ns_rebalancer:0:info:message(ns_1@172.23.99.148) - Starting failing over ['ns_1@172.23.99.150']