If you manage your firewall by hand have issues with connection trough ftp, try adding this.
# FTP Helper (beginning of script) modprobe ip_conntrack_ftp modprobe ip_nat_ftp ports=21 # ... # other rules # ... # FTP Helper iptables -A OUTPUT -o eth0 -p tcp --sport ftp -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport ftp-data -j ACCEPT # Drop rule #(end of script)