Node Master not discovered if I active XPACK

Elastic Stack Elasticsearch
1

My ElasticSearch Version: 6.6.1
My Enviroment: 3 nodes in 3 differents servers
Master: 192.168.1.142
Slave1: 192.168.1.144
Slave2: 192.168.1.146

Master Config YML:

cluster.name: elasticppo
node.name: ${HOSTNAME}
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
bootstrap.memory_lock: true
network.host: ["127.0.0.1","192.168.1.142"]
discovery.zen.ping.unicast.hosts: ["192.168.1.142","192.168.1.144","192.168.1.146"]
discovery.zen.minimum_master_nodes: 2
xpack.security.enabled: true
xpack.security.transport.ssl.verification_mode: certificate
xpack.security.transport.ssl.keystore.path: /etc/elasticsearch/certs/elasticmaster.p12
xpack.security.transport.ssl.truststore.path: /etc/elasticsearch/certs/elasticmaster.p12

Slave 1 Config YML:

cluster.name: elasticppo
node.name: ${HOSTNAME}
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
bootstrap.memory_lock: true
network.host: ["127.0.0.1","192.168.1.144"]
discovery.zen.ping.unicast.hosts: ["192.168.1.142","192.168.1.144","192.168.1.146"]
discovery.zen.minimum_master_nodes: 2
xpack.security.enabled: true
xpack.security.transport.ssl.verification_mode: certificate
xpack.security.transport.ssl.keystore.path: /etc/elasticsearch/certs/elasticslave1.p12
xpack.security.transport.ssl.truststore.path: /etc/elasticsearch/certs/elasticslave1.p12

Slave 2 Config YML:

cluster.name: elasticppo
node.name: ${HOSTNAME}
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
bootstrap.memory_lock: true
network.host: ["127.0.0.1","192.168.1.146"]
discovery.zen.ping.unicast.hosts: ["192.168.1.142","192.168.1.144","192.168.1.146"]
discovery.zen.minimum_master_nodes: 2
xpack.security.enabled: true
xpack.security.transport.ssl.verification_mode: certificate
xpack.security.transport.ssl.keystore.path: /etc/elasticsearch/certs/elasticslave2.p12
xpack.security.transport.ssl.truststore.path: /etc/elasticsearch/certs/elasticslave2.p12

Logs From Slave 2

[elasticslave2] not enough master nodes discovered during pinging (found [[Candidate{node={elasticmaster}{RhMwLe4rQO-oKoBjUxHFSw}{EaApLrYBTuu7R_Rko0xeKw}{192.168.1.142}{192.168.1.142:9300}{ml.machine_memory=8363855872, ml.max_open_jobs=20, xpack.installed=true, ml.enabled=true}, clusterStateVersion=-1}]], but needed [2]), pinging again

Logs from Slave 1

[elasticslave1] not enough master nodes discovered during pinging (found [[Candidate{node={elasticmaster}{RhMwLe4rQO-oKoBjUxHFSw}{EaApLrYBTuu7R_Rko0xeKw}{192.168.1.142}{192.168.1.142:9300}{ml.machine_memory=8363855872, ml.max_open_jobs=20, xpack.installed=true, ml.enabled=true}, clusterStateVersion=-1}]], but needed [2]), pinging again

curl GET _cat/indices to master, returns this error:

{
error: {
root_cause: [
{
type: "master_not_discovered_exception",
reason: null,
}
],
type: "master_not_discovered_exception",
reason: null,
},
status: 503,
}
2

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