Nmap scan report for ridongshen.com (47.244.238.44)
Host is up (0.15s latency).
Not shown: 994 filtered tcp ports (no-response)
PORT      STATE  SERVICE
21/tcp    closed ftp
22/tcp    closed ssh
80/tcp    open   http
443/tcp   open   https
465/tcp   closed smtps
60020/tcp closed unknown

Nmap done: 1 IP address (1 host up) scanned in 9.59 seconds