If you want to enable the Passive Port Range for Proftpd on your server then follow the below steps ::
open the /etc/proftpd.conf and add the Passive Port range anywhere in between the global directive.
[email protected][#] /etc/proftpd.conf<Global> ..... ..... PassivePorts 30000 65000 </Global>
Once done that restart proftpd service on the server .
Additionally, you have to open the same port range “30000 65000” in the server firewall as well.
For more information regarding this refer the URL :: http://proftpd.org/docs/directives/linked/config_ref_PassivePorts.html.