Enable Passive FTP in ISPConfig

To enable Passive FTP in Debian/Ubuntu installation of ISPConfig, run

echo "40110 40210" > /etc/pure-ftpd/conf/PassivePortRange

Restart pure-ftpd

service pure-ftpd-mysql restart

Now open ports 40110-40210 in firewall.

On CSF Firewall, edit

vi /etc/csf/csf.conf

Add

40110:40210

At ened of TCP_IN line.

Example

TCP_IN = "20,21,22,25,53,80,110,143,443,465,587,993,995,3333,8080,8090,19999,40110:40210"

if you are using AWS, you need to run

echo "YOUR_EXTERNAL_IP_ADDR" > /etc/pure-ftpd/conf/ForcePassiveIP
service pure-ftpd-mysql restart