Hi..
here is what you need for pf.conf and ftp-proxy to work.. modify it to suit your needs
int="xl1"
ext="xl0"
lan=$int:network
localhost="127.0.0.1"
tcp_services = "{www, ftp-proxy, ftp-data, ftp}"
udp_services = "{ domain, ntp}"
icmp_types = "{ echoreq, unreach }"...