I'm currently working on the firewall when I discovered that the firewall exposes a lot of ports outside of the internal network. I discovered this when setting up a new FTP server using a basic nmap scan of the FTP-server.
The scan reveals more than a 100 open ports. Is this a security vulnerability? Is there a way to hide these ports from nmap while still being open? Should these ports be filtered out?
Some of the ports are: ssh, http, https, socks, ftp, postgresql and some of the ports are labeled as unknown.