FTP server will not initiate DATA connection back to client

[Andrew L. Gould]

On Thursday 01 July 2004 07:45 am, freebsd at stateautomation.com wrote:
> I am running FreeBSD 4.9 RELEASE running the standard ftpd.  I can
> act as an ftp client from the console OK, however when I try to ftp
> from a client PC to the server running ftpd (which is running ipfw)
> the ftp server receives the packet sent to port 21 and replies
> however it will not initiate a DATA connection back to the client
> from port 20.  I had my client configured to use ACTIVE FTP.  I have
> also tried PASSIVE without any difference.  I do not have a firewall
> on the client and can successfully FTP to another FreeBSD box.
> None of the rules on my firewall that deny packets coming back from
> the ftp servers ipfw firewall are being hit. Does anyone have any
> ideas? Regards, J.S

In /etc/services, I see the following lines related to ftp:

ftp-data       20/tcp    #File Transfer [Default Data]
ftp-data       20/udp    #File Transfer [Default Data]
ftp              21/tcp    #File Transfer [Control]
ftp              21/udp    #File Transfer [Control]

Are all of these ports open in the firewall?  Sending and receiving?  (I 
don't know if all of the ports are needed or not.)

Best of luck,

Andrew Gould