[squid-users] Unable connect to site FTP through client FireFTP or similar (Filezilla)

Hello, I have RHLE 5.4 and squid3.0Stable19 and I need to connect FTP
Client through proxy server.
When I was connected with web browser its is OK and when I was used the
FireFTP or another FTP client the connection is unable whit time out.
(report the client)
I look the access.log and in the second case was not registered the
intend...

Any ideas?

my squid.conf

acl FTP proto ftp

acl SSL_ports port 443 21
acl Safe_ports port 80 81 21 443 70 210 1025-65535 280 488 591 777

ftp_user anonymous_at_invap.com.ar
ftp_list_width 32
ftp_passive on
ftp_sanitycheck on
ftp_telnet_protocol on

refresh_pattern ^ftp: 1440 20% 10080

refresh_pattern ^gopher: 1440 0% 1440

refresh_pattern (cgi-bin|\?) 0 0% 0

refresh_pattern . 0 20% 4320

always_direct Allow FTP

-- 
Lic. Mariel Sebedio
Division Computos y Sistemas
Tel (02944)-445400 int 2307
INVAP S.E. - www.invap.com.ar