FTP data connection on port 20?

[Schmolzi, Christian]

Hi,

When using the server in active mode, is it possible to restrict it to
using local port 20 (standard ftp-data)? As far as I can see, it uses
local ports > 1024 which makes it impossible to get through our
firewall.

I tried to change the code in FtpDataConnection from

    m_dataSoc = new Socket(m_address, m_port);

to 

    m_dataSoc = new Socket(m_address, m_port,
InetAddress.getLocalHost(), 20);

but that led to BindExceptions when several clients tried to connect. 

Do you have any ideas how to resolve this problem?

Regards,
Chris