RE: "Cannot Connect" FTP

[Chris Bipes <chris.bipes@xxxxxxxxxxxxxxx>]

Are the mainframes/remote computers all trying to connect using the same
profile?  Is your network bandwidth pegged from one mainframe connection
thus a second connection timing out?  Can you increase the mainframe FTP
client timeout value?  How many simultaneous connection are present when the
failure happens?  Is there routers and or bridges between the systems?

Hopefully this raises enough question to help you solve your problem.
Please let us, (the list), know what fixes the problem.
 

Christopher K. Bipes      mailto:ChrisB@Cross-Check.com
Operations & Network Mgr  mailto:Chris_Bipes@Yahoo.com
CrossCheck, Inc.                  http://www.cross-check.com
6119 State Farm Drive     Phone: 707 586-0551 x 1102
Rohnert Park CA  94928    Fax: 707 586-1884

-----Original Message-----
From: D.BALE@handleman.com [mailto:D.BALE@handleman.com]
Sent: Wednesday, May 09, 2001 8:50 AM
To: MIDRANGE-L@midrange.com
Subject: "Cannot Connect" FTP

Invariably and unpredictably, a mainframe FTP job will abend with "Cannot
Connect".  A few minutes later, another mainframe FTP job will run
successfully.

I've been asked to look at the AS/400 side to see if there's anything we can
do to keep this from happening.  This is NOT my area of expertise.  What
I've
noticed is that our branch boxes have numerous QTFTPnnnnn jobs, for example,
our Indianapolis box has 13 of these jobs "active".  When I prompt CHGNETA
on
this box, the "Number of initial servers" is set to 5.  I presume (awaiting
correction from the list) that somewhere along the line since the last IPL
in
October, we had 13 FTP server jobs actively transferring files from the
mainframe to the AS/400.

So, I have been asked to consider changing the "Number of initial servers"
to
the maximum of 20, with the goal of minimizing the "Cannot Connect"
mainframe
abends.  This doesn't make complete sense to me, but I'd be willing to try
it
if there's no downside to doing so.  I presume that if a server job is not
in
use, eventually it gets paged out of memory with no hit on performance.

Or are we slaying the wrong dragon?
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