OpenVAS on all interfaces

By default OpenVAS only listens for connections on 127.0.0.1, if you want to access it off-machine you'll need to do this:

cd /lib/systemd/system && sed -e 's/127.0.0.1/0.0.0.0/g' greenbone-security-assistant.service openvas-manager.service openvas-scanner.service -i.BAK

After that do a systemctl daemon-reload and either reboot or restart those services using systemctl. The grep command will create a file of the same name with a .BAK extension in that directory should something go wrong.