PASV just controls who establishes the data channel. Once it's up then
there's no difference. PC based FTP clients tend to use PORT to instruct
the server to connect back on port 20 (usually) - ok on a single user
platform. The AS/400 FTP client (and others) attempt to use PASV first
to get the server to designate a port that the client will then connect
to. This allows for a range of data port numbers to be in use. Security
issues and firewalls can place constraints on who can connect to whom on
what port number which is why the random range port number selection can
fail.   

TrailBlazer Systems, Inc.
http://www.softwarejungle.com
AS/400 E-Commerce Solutions

Chaos, panic, & disorder - my work here is done.

> -----Original Message-----
> From: Art Tostaine, Jr. [SMTP:Art@link400.com]
> Sent: Thursday, November 18, 1999 10:23 AM
> To:   MIDRANGE-L@midrange.com
> Subject:      RE: FTP Problem
> 
> One other thing, are there any downsides to always use SENDPA?
> 
> I have a simple command line interface to FTP to send save files (and
> other files).
> 
> Does SENDPA cause slower transmissions?  
> 
> Art Tostaine, Jr.
> CCA, Inc.
> Jackson, NJ 08527
> 
> [mailto:owner-midrange-l@midrange.com]On Behalf Of Tim McCarthy
> 
> Sounds like a PASV problem. My guess is the creation of the data path
> from the client to the server is blocked through a firewall or you
> have
> some sort of port restriction in place. Try issuing a SENDPA on your
> AS/400 client before doing your PUT and see if that works.
> 
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