Hi John,
I'm not a TCP/IP person but from my searches...

On the return code 426:
The FTP server sends message that it's about
to open a data connection but we don't see an incoming SYN from port
20 and 2 seconds later, it sends "426 Connection closed. Transfer
aborted" which causes the control connection to be closed.
This could be due to a firewall not allowing the data
connection to flow.

On the meaning of out-of-band:
It relates to the method
of signaling between the client and server. Normally subcommands
are processed one after the other and are received within the data
stream (or in band). In the case of an ABOR, you don't want the other
end to wait to get your command, so it is sent Out of Band. You really
want to interrupt the other end and have it respond to the ABOR
instead of finishing what it was doing.
Out of Band is a method of signalling that gets processed immediately.

Please don't ask me what any of that means.

 --
Regards,
George Kozakos
z/OS Level 2 Software Service

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