• Subject: RE: FTP Problem
  • From: "Art Tostaine, Jr." <Art@xxxxxxxxxxx>
  • Date: Thu, 18 Nov 1999 15:52:23 -0500
  • Importance: Normal

I get it.  Thanks!

Art Tostaine, Jr.
CCA, Inc.
Jackson, NJ 08527


-----Original Message-----
From: owner-midrange-l@midrange.com
[mailto:owner-midrange-l@midrange.com]On Behalf Of Tim McCarthy
Sent: Thursday, November 18, 1999 2:57 PM
To: 'MIDRANGE-L@midrange.com'
Subject: RE: FTP Problem


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.   


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