FTP on squid

i have a problem listing files on remote server
using squid

firstly make sure to load ip_nat_ftp on squid kernel !important!

# Module required for active an FTP server using NAT
modprobe ip_nat_ftp

then
# iptables -A FORWARD -j ACCEPT

if this failed: enable ftp bypass on squid
http://labtestproject.com/linux_network/step_by_step_enable_ftp_on_squid_proxy_in_linux_fedora_10.html

acl FTP proto FTP

always_direct allow FTP

reload squid server and you're done

make sure to uncheck PASV transfer on your ftp client (see ref 1)

good reources to read more:
1. http://enterprisedt.com/products/edtftpjssl/doc/manual/html/howtoftpthroughafilewall.html
2. http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch14_:_Linux_Firewalls_Using_iptables