RE: Weird FTP problem -- like nothing I've ever seen before!

You are correct, it should seemingly work with passive mode disabled.

Is it possible the firewall requires the connection to originate from a specific IP address? I have had experiences like this where an IBM i had multiple IP interfaces defined, two bound to the actual physical network cards and six more virtual ones. I found the ftp connections were originating from one of the virtual interfaces and were being blocked.

Mark Clanton

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of James H. H. Lampert
Sent: Wednesday, May 23, 2018 11:22 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: Re: Weird FTP problem -- like nothing I've ever seen before!

On 5/23/18, 9:11 AM, MARK CLANTON wrote:

It looks like you have a firewall that is allowing the ftp command
port 21 through, but has a rule that is blocking the random high
number port being selected by passive mode for the actual data
transfer. You don't mention which release of the OS these boxes are
at.

But that, by itself, doesn't explain why it still fails with passive mode disabled.

--
JHHL
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