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ubuntu@ip-172-20-5-56:~/shopizer/sm-shop/src/main/java/com/salesmanager/shop/application$ sudo netstat -tulpn | grep LISTEN
tcp        0      0 0.0.0.0:8080            0.0.0.0:*               LISTEN      5188/java           
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      333/systemd-resolve 
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      878/sshd: /usr/sbin 
tcp6       0      0 :::22                   :::*                    LISTEN      878/sshd: /usr/sbin 

link đổi ipv6 ipv4: https://stackoverflow.com/questions/9882357/how-to-set-java-net-preferipv4stack-true-at-runtime