firewall
How to set PassivePortRange and PassiveIP in pure-ftpd on Debian and Ubuntu Linux
If you run a firewall on your Linux server and want to use passive FTP connections, you have to define…
Which ports are used on a ISPConfig 3 server and shall be open in the firewall?
Here is a list of ports that are used commonly on ISPConfig 3 servers. If you don't have all services…