Re: FTP SSL with large file transfer

This sounds like a problem we had while trying to send a PGPed
file to a bank. The banks server didn't understand what I think was a
window or windowing instruction (nothing to do with GUI). We tried a
different client and all was good. No SSL involved. Won't a trace help?

EdP




Hal Merritt <HMerritt@xxxxxxxxxxxxx>
Sent by: IBM Mainframe Discussion List <IBM-MAIN@xxxxxxxxxxx>
01/21/2009 12:11 PM
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Re: FTP SSL with large file transfer






It's the same server under z/os, but typically one of any number of client
software. I'd focus on the client software and the network appliances. A
transfer that just stops for no reason is often a firewall configuration
issue.
Firewalls typically say nothing (the 'black hole' behavior) or spoof
normal completion signals making each end think the other has asked for a
graceful close.

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxx] On
Behalf Of Hideko Igarashi
Sent: Wednesday, January 21, 2009 10:20 AM
To: IBM-MAIN@xxxxxxxxxxx
Subject: FTP SSL with large file transfer

The FTP server on z/OS 1.7 and the client is my Windows PC.
Normally FTP with SSL is running fine. From time to time, it hangs in the

middle of transfer from MF to PC. (no error message, it times out.) Today
it
worked with 5.5Mb but not with more than 10Mb. If I run FTP without SSL,
I
could download them all. If I think of it, the file size is usually more
than 5Mb
when the problem happens.
Is there any file size limitation to use SSL or any gatchu?

Hideko Igarashi


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