Cannot join nodes to master 2

[Julio_Edel_Salas_Dia (Julio Edel Salas Díaz)]

Hi, it is normal this error for to comunicate 2 nodes in an elasticsearch cluster?
This is network traffic between two master nodes, to join each other.

10.28.11.7.9300 > 10.28.11.8.48610: Flags [.], cksum 0xa1d5 (correct), ack 744, win 501, options [nop,nop,TS val 2850708992 ecr 727518300], length 0
10.28.11.8.48608 > 10.28.11.7.9300: Flags [P.], cksum 0x2be9 (incorrect -> 0x766a), seq 622632872:622633240, ack 1689967306, win 502, options [nop,nop,TS val 727518614 ecr 2850655996,nop,nop,sack 1 {1449:1709}], length 368

[Christian_Dahlqvist]

Which version are you using? What is the configuration of the nodes?

[Julio_Edel_Salas_Dia (Julio Edel Salas Díaz)]

I am using elasticsearch 7.6 and master node configuration is:

cluster.name: emc-cluster-01
node.name: emc-master-01
node.master: true
node.data: false
node.ingest: false
cluster.remote.connect: false
path.data: /var/lib/elasticsearch
path.logs: /var/log/elasticsearch
network.host: 0.0.0.0
discovery.seed_hosts: ["10.28.11.6", "10.28.11.7", "10.28.11.8"]
cluster.initial_master_nodes: ["emc-master-01", "emc-master-02", "emc-master-03"]

I can to say nodes are in two physical servers. If they are to gether, it work