Thanks Denys for the reply. We are looking at the TCP settings very closely at this point.
Miss the old HP3000 days... well, we still have a whole bunch of 3000's in production all around the state, I just miss the old days like HP World and local user groups and the great camaraderie.
wilson
-----Original Message-----
From: Denys Beauchemin [mailto:[log in to unmask]]
Sent: Monday, November 10, 2008 12:21 PM
To: Wong, Wilson; [log in to unmask]
Subject: RE: [HP3000-L] User Disconnect Issues
My first guess would be that your TCP timeout values are set wrong.
In NMCONFIG, go to the TCP page and see if you can change the Maximum Time
to wait for remote response to something link 300 or 400. You might also
want to drop the Retransmission interval to 1 so you don't get hung
sessions. My systems also has the initial retransmission interval set to 2
and the Maximum retransmission per packet set to 6. It's been a very long
time since I played with those values. Also, you may want to see how the
checksum is set.
I think Steve Cooper posted something about this some years back, maybe even
some time in the last century.
Denys...
-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf
Of Wong, Wilson
Sent: Monday, November 10, 2008 1:23 PM
To: [log in to unmask]
Subject: [HP3000-L] User Disconnect Issues
We have been experiencing a lot of user disconnects issues lately and have
not had a lot of success in pinpointing what is causing the problem nor
finding a good solution. We have multiple HP3000 processors located here on
site and the problem seems to be occurring on almost all of them but we have
not found any commonality. We have checked our network, hardware, software,
configurations, etc. with no luck.
Here is an additional description of the problem.
For some time now our user community has experienced a variety of
disconnects and we are running out of ideas to check. The typical behaviors
observed is, the user will be working in VPlus screens and transitioning
between screen, often to a non-VPlus screen (e.g. a menu), they will see
their screen go blank and after a bit the client (Minisoft or Reflections)
will report a disconnect.
We have performed a variety of network tests and believe the network to be
stable and substantially error free. We have added memory to the 3000 as
well as looked at the networking tuning parameters. We have rebuilt the
workstations and reviewed power-saver, terminal emulator, network settings.
But clearly we have missed something.
In the packet captures we have done on the HP3000 side, the work station
seems to be working fine for some extended period of time, and we will see
several duplicate ACK issued from the client and several retransmission from
the HP3000 then the connection "goes away". Occasionally we have seen a RST
issued from the HP3000, but generally not. At this point the HP3000 user
session is also terminated.
Any help would be much appreciated.
Thanks, Wilson Wong
Wilson Wong
HP3000 Systems Administrator
WA State Board for Community and Technical Colleges
3101 Northup Way, Suite 100
Bellevue, WA 98004
(425) 803-9764
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