Run Elasticsearch 5.2 on 2 machines but in the same cluster - elasticsearch

Question

i want to run Elasticsearch on two servers in the same cluster.
The Problem is : I can't connect the 2 servers on elasticsearch. I mean i can't get the 2 nodes on the same cluster.
can somebody tell me if my Configuration in the elasticsearch.yml is right and
Sever 1:
cluster.name: MyData
node.name: Node_1
network.host: '192.160.122.4'
http.port: 9200
discovery.zen.ping.unicast.hosts: ["192.160.122.4","192.160.122.3"]
Server2:
cluster.name: MyData
node.name: Node_2
network.host: '192.160.122.3'
http.port: 9200
discovery.zen.ping.unicast.hosts: ["192.160.122.4","192.160.122.3"]
what i need to change it ?
Thanks
to the Logs:
Log of server 1:
[2017-03-21T10:38:18,859][INFO ][o.e.n.Node ] [Node_1]
initialized
[2017-03-21T10:38:18,906][INFO ][o.e.n.Node ] [Node_1]
starting ...
[2017-03-21T10:38:19,764][INFO ][o.e.t.TransportService ] [Node_1]
publish_address {192.160.122.4:9300}, bound_addresses {192.160.122.4:9300}
[2017-03-21T10:38:19,764][INFO ][o.e.b.BootstrapChecks ] [Node_1] bound
or publishing to a non-loopback or non-link-local address, enforcing
bootstrap checks
[2017-03-21T10:38:22,899][INFO ][o.e.c.s.ClusterService ] [Node_1]
new_master {Master-Node_1}{4ZEftg6TRCOJqE0kEv-Mrg}{MYrWUFABQ5OOT0US73j13w}
{192.160.122.4}{192.160.122.4:9300}, reason: zen-disco-elected-as-master
([0]
nodes joined)
[2017-03-21T10:38:22,950][INFO ][o.e.h.HttpServer ] [Node_1]
publish_address {192.160.122.4:9200}, bound_addresses {192.160.122.4:9200}
[2017-03-21T10:38:22,997][INFO ][o.e.n.Node ] [Node_1] started
[2017-03-21T10:38:23,948][INFO ][o.e.g.GatewayService ] [Node_1]
recovered [5] indices into cluster_state
[2017-03-21T10:38:32,357][INFO ][o.e.c.r.a.AllocationService] [Node_1]
Cluster health status changed from [RED] to [YELLOW] (reason: [shards
started [[node_1][4]] ...]).
Log of Server2:
[2017-03-21T11:55:57,277][INFO ][o.e.n.Node ] [Node_2] initialized
[2017-03-21T11:55:57,293][INFO ][o.e.n.Node ] [Node_2] starting ...
[2017-03-21T11:56:01,099][INFO ][o.e.t.TransportService ] [Node_2] publish_address {192.160.122.3:9300}, bound_addresses {192.160.122.3:9300}
[2017-03-21T11:56:01,115][INFO ][o.e.b.BootstrapChecks ] [Node_2] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks
[2017-03-21T11:56:01,115][ERROR][o.e.b.Bootstrap ] [Node_2] node validation exception
bootstrap checks failed
JVM is using the client VM [Java HotSpot(TM) Client VM] but should be using a server VM for the best performance
[2017-03-21T11:56:01,146][INFO ][o.e.n.Node ] [Node_2] stopping ...
[2017-03-21T11:56:01,193][INFO ][o.e.n.Node ] [Node_2] stopped
[2017-03-21T11:56:01,193][INFO ][o.e.n.Node ] [Node_2] closing ...
[2017-03-21T11:56:01,240][INFO ][o.e.n.Node ] [Node_2] closed