RE: FTP data port

["Carl Galgano" <cgalgano2@xxxxxxxxxxxxxxxxx>]

Steven:
I THINK there is a FTP subcommand called PORT.  You may have to run it using
QUOTE PORT, or QUOTE SITE PORT.  I am not sure, but something in the old
memory seems to make me think you can do this.  Hope it points you in the
right direction.
cjg

Carl J. Galgano
EDI Consulting Services, Inc.
550 Kennesaw Avenue, Suite 800
Marietta, GA  30060
(770) 422-2995 - voice
(419) 730-8212 - fax
mailto:cgalgano@xxxxxxxxxxxxxxxxx
http://www.ediconsulting.com
AS400 EDI, Networking, E-Commerce and Communications Consulting and
Implementation 
http://www.icecreamovernight.com
Premium Ice Cream Brands shipped Overnight

"You ain't gonna learn what you don't want to know" - rw

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Steven.Gray@xxxxxxxxxxxxxx
Sent: Thursday, June 12, 2003 12:38 PM
To: midrange-l@xxxxxxxxxxxx
Subject: FTP data port


All,

I know that by default FTP uses port 21 as the command port and port 20 as
the data port. I am trying to send data to an external server via an As400
FTP connection (OS/400 V4.5). 

Unfortunately for me they have certain restrictions. These being :-

a. The command port must be port 10021
b. The data port must be port 10020
c. Passive mode must be OFF.
d. PORT mode must be ON.

Now I can connect to the server 192.168.36.2 10021 which allows me to
connect using command port 10021.

>From this I can run the commands
SENDPASV 0      - turn off passive mode
SENDPORT 1      - turn on port mode

but as soon as I try to put or get data the error message
'425 can't build data connection: connection timed out'  appears.

The connection is going through a firewall , which has been examined , and
all that is shown is the initial connection over port 10021. No mention of
port 20 or 10020 appears.

I think this may have something to do with the data port 10020 not being
correctly set on the AS400.But how do I do this ?

Looking at WRKTCPSTS option 3 shows my local port 21 in the list at a listen
status , but no port 20.

When the connection is active , remote port 10021 is displayed against the
customers IP address , but no port 20 or 10020.

Is this the problem? If so how do I correct this and are there any security
issues that I should be made aware of if port 20 or port 10020 are open?