hi all,

i have a ftp client (command-line version). This client connects to an FTP server (vsftpd) non-interactively in a shell script. In between, there is a squid server + firewall. I have made NAT for port 21 but after logged in, i got error
when I issued ls command.

When I typed passive ti turn on passive mode, the ls command ccouldnot get the list of files. It hang for a long time.

What caused this?
Can anyone give some ideas to solve this?
how to configure the ftp client (commandline) to connect using proxy (squid)?

My client : Linux, commandline ftp
my server : vsftpd, Linux
my firewall : linux, iptables, squid, dansguardian

You need to add port 20. FTP is out-of-band....

i have added port 20 for NAT. still out of luck.