Modify/Force FTP passive ports

I am running Debian Squeeze on ISPConfig 3 perfect sever with nginx. I need to change pure-ftp passive ports to use a certain range to get this working properly with my firewall. I can't find the file to edit for pure-ftp?

thanks

 

my error

Here is my Filezilla error: (Internal IP is 10.0.0.60, if I switch to Active FTP does work fine.)

Code:

Response:	200 Data protection level set to "private"
Status:	Connected
Status:	Retrieving directory listing...
Command:	PWD
Response:	257 "/" is your current location
Command:	TYPE I
Response:	200 TYPE is now 8-bit binary
Command:	PASV
Response:	227 Entering Passive Mode (10,0,0,60,15,89)
Status:	Server sent passive reply with unroutable address. Using server address instead.
Command:	MLSD
Error:	Connection timed out
Error:	Failed to retrieve directory listing

 

Thanks so much!