Currently my firewall it's disable:
mservice@sentinel:~$ sudo ufw status
Status: inactive
mservice@sentinel:~$ sudo netstat -plnt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.1.1:5601 0.0.0.0:* LISTEN 6189/node
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 6260/nginx: master
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 536/systemd-resolve
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 798/sshd
tcp6 0 0 192.168.10.128:9200 :::* LISTEN 6113/java
tcp6 0 0 192.168.10.128:9300 :::* LISTEN 6113/java
tcp6 0 0 :::22 :::* LISTEN 798/sshd