I guess my response wasn't as clear as I thought it was. Ftp clients have a
default for passive mode. Some default to using it and others to having it
off. I have encountered ftp clients in the PC world that have problems with
the default mode. Often its because of a firewall issue somewhere along the
line. Changing that setting in the client by using the PASSIV command often
works for me.
there is no nat and firewall in between.
and i tried unix ftp client with passive off and on - both works.