Thanks for your answer. I already had a look on this article and I use it to create new packet filters. I have also created a protocol definition FTP custom which uses port 2121 with 2 secondary connections.(0 for inbound and 1025 to 65534 for outbound) but it was unsuccessfull. so I don't understand ! Do I have some changes to do on my firewall ?? or did I forget some parameters on ISA ??