The File Transfer Protocol (FTP) is a standard communication protocol used for the transfer of computer files from a server to a client on a computer network. The FTP over SSL port (21) is open on your virtual machine and allows all incoming traffic from the Internet. In order to keep security best practices, you should restrict access to be only from allowed IP addresses.
Recommended Mitigation
Configure networking rule to allow incoming FTP over SSL traffic from allowed IP addresses only.
Network misconfigurations
