Hi, I'm dealing with this problem too. The only way i got the ftp client working, was to open all outbound and inbound traffic...... (bye bye firewall) i think it's because ftp uses upper ports for communication, and on the isa server there is no firewall client and no secure nat client. the only way would be to open all the ports, and that's no good for security reasons. maybe someone else has a good idea how to solve this problem