Editing FileZilla server Tutorial (en) (section)

==Enable Passive mode port range==
To allow remote connections to your FTP server through a firewall and/or router you will need to set a port range. Click ''Server'' from the menu and ''Configure'' (Ctrl+F), Expand ''FTP Server'' menu tree (if not already), click ''Passive mode'', ensure the ''Use custom port range'' check box is ticked and set a custom port range of at least 100 ports in the ''From'' and ''To'' boxes, this can be any range between '''49152''' and '''65534''' (eg. 52100 to 53100). Leave the ''Use custom host'' blank and ensure the ''Use the default host for local connection'' check box is ticked.