trouble using ftp.exe to connect to external site

I am having difficulty copying data out of my network by ftp when
using ftp.exe.
I can contact ftp servers, login, but ftp.exe just hangs when trying
to get the directory listing.
This happens on any machine that accesses the internet through the SBS
server and on the SBS server it self.
The SBS server is at SP2 and has had ISA installed in the past but it
was removed.
I have no problems using internet explorer as an FTP client though.
I am also having problems with a closed source program that copies
data out by ftp. This program runs on the SBS server. It does not have
any options to turn PASV on or off. when copying out data it returns
an error :

200 PORT command successful
425 could not open data connection to port 34083 connection timed out

could the problem be old rules from the ISA installation or something
else in the networking stack?

.

Relevant Pages

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