Scan public IP

I have installed openvas 9 on AWS ubuntu instance and using it through its python library. I can connect it publicly and can created targets, launch scan, delete scan. But while the scanning if I set my public ip or IPv4 ip as a target then scan id generated but could not get report. I have turn off the firewall at the time of scanning of my local system. but still not getting any result. Is there any thing left i have to set up?