To enable passive mode for FTP connections on your server:
1 Log in as “root” to the server shell over SSH.
2 Edit your ProFTPD configuration file.
a Issue the command vi /etc/proftpd.conf
b Add the following lines anywhere within the section:
PassivePorts 49152 65534
c Save the file
3 Log in to Parallels Plesk Panel as “admin”, go to Modules > Firewall, and
click Edit Firewall Configuration.
4 Click Add Custom Rule.
5 Specify the following:
a Rule name
b Direction: select Incoming.
c Action: select Allow.
d Ports: in the Add port input box, enter the value 49152-65534. Leave the TCP
option selected, and click Add.
PassivePorts 60000 65535