Cannot connect to cluster when using RequestProleReplicas = true

I am trying to do this on a CentOS box

policy := aerospike.NewClientPolicy()
// We need to request prole replicas in order to distribute
// reads across both master and prole nodes
policy.RequestProleReplicas = true
client, err := aerospike.NewClientWithPolicy(policy, "", 3000)

I get the following error:

panic: Error while setting up aerospike db, with error: Failed to connect to host(s): []; error: Failed to connect to host(s): []. The network connection(s) to cluster nodes may have timed out, or the cluster may be in a state of flux.

The centos box is running Aerospike Community Edition 3.5.8.

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