开放端口

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Instances >> Instance Details 
                        >> Attached VNICs >> Subnet or VLAN
                                  >> Subnet - subnet-YYYYMMDD-HHMM >> Security Lists
                                           >>  add rules for TCP/UDP/ICMP ...

Ubuntu防火墙设置:

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sudo iptables -L
sudo apt remove iptables-persistent
sudo apt purge netfilter-persistent
sudo iptables -L
sudo iptables -P INPUT ACCEPT
sudo iptables -P FORWARD ACCEPT
sudo iptables -P OUTPUT ACCEPT
sudo iptables -L
sudo iptables -F
sudo reboot

Comments: (on github issue)