Not able to login to ViPR - C

I am not able to login to ViPR - C GUI. This is the error on the browser Service unavailable (6503) Can some one direct me to right KB article or document where I can list the services. I logged into one of the nodes and I see this error: 2017-11-05 08:26:16,057 [main] ERROR  ConnectionState.java (line 200) Connection timed out for connection string (10.236.40.1:2181,10.236.40.2:2181,10.236.40.3: 2181,10.236.40.4:2181,10.236.40.5:2181) and timeout (180000) / elapsed (433454) org.apache.curator.CuratorConnectionLossException: KeeperErrorCode = ConnectionL oss