I've battled FTP issues for years but have always managed to keep my FTP
servers working behind Gnatbox by relying on the automatic handling of
PASV at the firewall. I've started doing SSL on my FTP and in order to
make it work I had to specify the outside IP in the configuration of my
FTP server and open a port range for PASV. This worked great for SSL,
but now the non-SSL connections no longer work. From looking at all my
logs and the traffic it appears that the firewall is still attempting to
mess with the PASV traffic. If I change the port from 21 to something
else it works fine so I'm guessing that the firewall does something with
the traffic based on the port. Is there a way to pass port 21 in to my
FTP server without necessarily triggering any special handling of FTP at
the firewall? I have my PASV ports open and the server can handle it
from there.
Chris Green
AMDG Technology
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