NcFTP v2.3.0 will work with a firewall, gateway or a system that utilizes
ip masquerading.  To insure NcFTP functions properly, do the following:

In 'prefs', set Default FTP mode to:

    Passive, but fall back to port if needed 

                or

    Passive FTP only (PASV)

If you experience timeouts, increase the network timeout field in prefs.

    Network timeout:        60

Also, insure the remote host can handle PASV commands and that option is 
set to yes in the bookmarks editor:

    Can use passive FTP:    Yes