@aseishas sent me UFW rules, so I should put those into the Initial Configuration page! These are used in Ubuntu 18.04 LTS.
$ sudo ufw allow in from 54.237.254.192/29 to any port 7512 proto tcp
$ sudo ufw allow proto tcp to any port 50000:51000
$ sudo ufw allow proto udp to any port 50000:51000```
@aseishas sent me UFW rules, so I should put those into the Initial Configuration page! These are used in Ubuntu 18.04 LTS.