1) Go to the corresponding folder:
cd /lib/systemd/system
2) Change the loopback address to the omnidirectional address:
sed -e 's/127.0.0.1/0.0.0.0/g' greenbone-security-assistant. service openvas-manager.service openvas-scanner.service -i
3) Let the system reload all configuration:
systemctl daemon-reload
4) Restart the corresponding services:
systemctl restart greenbone-security-assistant. service openvas-manager.service openvas-scanner.service
5) Check all ports:
ss -nalt