Hi @dadoonetDadoonet,
Merry Christmas!
I'm able to connect via the transport client after marking client.transport.sniff as false. As the server for dev environment, the cluster only contains one node. However, in one another project where elasticsearch-2.3.3 is used, with client.transport.sniff is set to true, along with the presence of only one node in the cluster, there weren't any issues relating to it. Please shed some light on it.