I'm using Akka 2.3.15 (java) and I'm trying to get a cluster with two 
members in two different hosts. Everything runs fine when I start the two 
nodes on a single machine, but then when I try to start up the second node 
on a different machine, it keeps getting "Association with remote system 
[...] has failed". 
I know I'm probably not configuring it right, but I don't know exactly how 
to do it.

So in the hostA (ip 192.168.2.21) I'm running an actor on 2552 that joins 
successfully to the cluster. The application.conf looks like:

akka {
  actor {
    provider = "akka.cluster.ClusterActorRefProvider"
  }  
  remote {
    log-remote-lifecycle-events = off
    netty.tcp {
      hostname = "192.168.2.21"
      port = 0
    }
  }
  cluster {
    seed-nodes = [
      "akka.tcp://MulticastPocCluster@192.168.2.21:2552"]

  }
}
akka.cluster.metrics.enabled=off
akka.extensions=["akka.cluster.metrics.ClusterMetricsExtension"]
akka.cluster.metrics.native-library-extract-folder=${user.dir}/target/native

I've copied everything over to hostB (ip 192.168.2.55), modified the 
application.conf file to:

akka {
  actor {
    provider = "akka.cluster.ClusterActorRefProvider"
  }
  remote {
    log-remote-lifecycle-events = off
    netty.tcp {
      hostname = "192.168.2.55"
      port = 0
    }
  }
  cluster {
    seed-nodes = [
      # Seed node in the other host
      "akka.tcp://MulticastPocCluster@192.168.2.21:2552"]
  }
}
akka.cluster.metrics.enabled=off
akka.extensions=["akka.cluster.metrics.ClusterMetricsExtension"]
akka.cluster.metrics.native-library-extract-folder=${user.dir}/target/native

I've verified that I can ping hostA from hostB by ip address. But I get 
this error when I try to start up an actor on hostB:

INFO] [09/21/2016 12:52:53.229] 
[MulticastPocCluster-akka.remote.default-remote-dispatcher-6] 
[akka.tcp://MulticastPocCluster@192.168.2.55:2552/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2FMulticastPocCluster%40192.168.2.21%3A2552-1]
 
No response from remote for outbound association. Associate timed out after 
[15000 ms].
[WARN] [09/21/2016 12:52:53.232] 
[MulticastPocCluster-akka.remote.default-remote-dispatcher-5] 
[akka.tcp://MulticastPocCluster@192.168.2.55:2552/system/endpointManager/reliableEndpointWriter-akka.tcp%3A%2F%2FMulticastPocCluster%40192.168.2.21%3A2552-0]
 
Association with remote system 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552] has failed, address is 
now gated for [5000] ms. Reason: [Association failed with 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552]] Caused by: [No response 
from remote for outbound association. Associate timed out after [15000 ms].]

Log from hostA:

[INFO] [09/21/2016 12:51:14.402] [main] [akka.remote.Remoting] Starting 
remoting
[INFO] [09/21/2016 12:51:14.649] [main] [akka.remote.Remoting] Remoting 
started; listening on addresses 
:[akka.tcp://MulticastPocCluster@192.168.2.21:2552]
[INFO] [09/21/2016 12:51:14.663] [main] 
[akka.cluster.Cluster(akka://MulticastPocCluster)] Cluster Node 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552] - Starting up...
[INFO] [09/21/2016 12:51:14.762] [main] 
[akka.cluster.Cluster(akka://MulticastPocCluster)] Cluster Node 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552] - Registered cluster JMX 
MBean [akka:type=Cluster]
[INFO] [09/21/2016 12:51:14.762] [main] 
[akka.cluster.Cluster(akka://MulticastPocCluster)] Cluster Node 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552] - Started up successfully
[INFO] [09/21/2016 12:51:14.796] 
[MulticastPocCluster-akka.actor.default-dispatcher-2] 
[akka.cluster.Cluster(akka://MulticastPocCluster)] Cluster Node 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552] - Node 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552] is JOINING, roles []
[INFO] [09/21/2016 12:51:14.809] 
[MulticastPocCluster-akka.actor.default-dispatcher-2] 
[akka.cluster.Cluster(akka://MulticastPocCluster)] Cluster Node 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552] - Leader is moving node 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552] to [Up]
sep 21, 2016 12:51:15 PM kamon.sigar.SigarProvisioner provision
ADVERTENCIA: Sigar library is already provisioned.
[INFO] [09/21/2016 12:51:15.376] 
[MulticastPocCluster-akka.actor.default-dispatcher-3] 
[akka.cluster.Cluster(akka://MulticastPocCluster)] Cluster Node 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552] - Metrics collection has 
started successfully

Log from hostB:

[INFO] [09/21/2016 12:52:37.915] [main] [akka.remote.Remoting] Starting 
remoting
[INFO] [09/21/2016 12:52:38.087] [main] [akka.remote.Remoting] Remoting 
started; listening on addresses 
:[akka.tcp://MulticastPocCluster@192.168.2.55:2552]
[INFO] [09/21/2016 12:52:38.087] [main] 
[akka.cluster.Cluster(akka://MulticastPocCluster)] Cluster Node 
[akka.tcp://MulticastPocCluster@192.168.2.55:2552] - Starting up...
[INFO] [09/21/2016 12:52:38.165] [main] 
[akka.cluster.Cluster(akka://MulticastPocCluster)] Cluster Node 
[akka.tcp://MulticastPocCluster@192.168.2.55:2552] - Registered cluster JMX 
MBean [akka:type=Cluster]
[INFO] [09/21/2016 12:52:38.165] [main] 
[akka.cluster.Cluster(akka://MulticastPocCluster)] Cluster Node 
[akka.tcp://MulticastPocCluster@192.168.2.55:2552] - Started up successfully
sep 21, 2016 12:52:38 PM kamon.sigar.SigarProvisioner provision
ADVERTENCIA: Sigar library is already provisioned.
[INFO] [09/21/2016 12:52:38.272] 
[MulticastPocCluster-akka.actor.default-dispatcher-14] 
[akka.cluster.Cluster(akka://MulticastPocCluster)] Cluster Node 
[akka.tcp://MulticastPocCluster@192.168.2.55:2552] - Metrics collection has 
started successfully
[INFO] [09/21/2016 12:52:53.229] 
[MulticastPocCluster-akka.remote.default-remote-dispatcher-6] 
[akka.tcp://MulticastPocCluster@192.168.2.55:2552/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2FMulticastPocCluster%40192.168.2.21%3A2552-1]
 
No response from remote for outbound association. Associate timed out after 
[15000 ms].
[WARN] [09/21/2016 12:52:53.232] 
[MulticastPocCluster-akka.remote.default-remote-dispatcher-5] 
[akka.tcp://MulticastPocCluster@192.168.2.55:2552/system/endpointManager/reliableEndpointWriter-akka.tcp%3A%2F%2FMulticastPocCluster%40192.168.2.21%3A2552-0]
 
Association with remote system 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552] has failed, address is 
now gated for [5000] ms. Reason: [Association failed with 
[akka.tcp://MulticastPocCluster@192.168.2.21:2552]] Caused by: [No response 
from remote for outbound association. Associate timed out after [15000 ms].]
[INFO] [09/21/2016 12:52:53.264] 
[MulticastPocCluster-akka.actor.default-dispatcher-3] 
[akka://MulticastPocCluster/deadLetters] Message 
[akka.cluster.InternalClusterAction$InitJoin$] from 
Actor[akka://MulticastPocCluster/system/cluster/core/daemon/joinSeedNodeProcess-1#-1019468403]
 
to Actor[akka://MulticastPocCluster/deadLetters] was not delivered. [1] 
dead letters encountered. This logging can be turned off or adjusted with 
configuration settings 'akka.log-dead-letters' and 
'akka.log-dead-letters-during-shutdown'.
[INFO] [09/21/2016 12:52:53.264] 
[MulticastPocCluster-akka.actor.default-dispatcher-3] 
[akka://MulticastPocCluster/deadLetters] Message 
[akka.cluster.InternalClusterAction$InitJoin$] from 
Actor[akka://MulticastPocCluster/system/cluster/core/daemon/joinSeedNodeProcess-1#-1019468403]
 
to Actor[akka://MulticastPocCluster/deadLetters] was not delivered. [2] 
dead letters encountered. This logging can be turned off or adjusted with 
configuration settings 'akka.log-dead-letters' and 
'akka.log-dead-letters-during-shutdown'.
[INFO] [09/21/2016 12:52:53.264] 
[MulticastPocCluster-akka.actor.default-dispatcher-3] 
[akka://MulticastPocCluster/deadLetters] Message 
[akka.cluster.InternalClusterAction$InitJoin$] from 
Actor[akka://MulticastPocCluster/system/cluster/core/daemon/joinSeedNodeProcess-1#-1019468403]
 
to Actor[akka://MulticastPocCluster/deadLetters] was not delivered. [3] 
dead letters encountered. This logging can be turned off or adjusted with 
configuration settings 'akka.log-dead-letters' and 
'akka.log-dead-letters-during-shutdown'.
[INFO] [09/21/2016 12:52:53.264] 
[MulticastPocCluster-akka.actor.default-dispatcher-3] 
[akka://MulticastPocCluster/deadLetters] Message 
[akka.cluster.InternalClusterAction$InitJoin$] from 
Actor[akka://MulticastPocCluster/system/cluster/core/daemon/joinSeedNodeProcess-1#-1019468403]
 
to Actor[akka://MulticastPocCluster/deadLetters] was not delivered. [4] 
dead letters encountered. This logging can be turned off or adjusted with 
configuration settings 'akka.log-dead-letters' and 
'akka.log-dead-letters-during-shutdown'.
[INFO] [09/21/2016 12:52:53.357] 
[MulticastPocCluster-akka.actor.default-dispatcher-18] 
[akka://MulticastPocCluster/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2FMulticastPocCluster%40192.168.2.21%3A2552-1]
 
Message [akka.actor.Status$Failure] from 
Actor[akka://MulticastPocCluster/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2FMulticastPocCluster%40192.168.2.21%3A2552-1#-1432534155]
 
to 
Actor[akka://MulticastPocCluster/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2FMulticastPocCluster%40192.168.2.21%3A2552-1#-1432534155]
 
was not delivered. [5] dead letters encountered. This logging can be turned 
off or adjusted with configuration settings 'akka.log-dead-letters' and 
'akka.log-dead-letters-during-shutdown'.
[INFO] [09/21/2016 12:53:13.298] 
[MulticastPocCluster-akka.remote.default-remote-dispatcher-19] 
[akka.tcp://MulticastPocCluster@192.168.2.55:2552/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2FMulticastPocCluster%40192.168.2.21%3A2552-2]
 
No response from remote for outbound association. Associate timed out after 
[15000 ms].

Maybe I don't understand how to configure my nodes correctly and I'm just 
getting confused with the remote and/or cluster configuration.

Thanks for your help!

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