User Disconnect Issues - Hewlett Packard

This is a discussion on User Disconnect Issues - Hewlett Packard ; 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 ...

+ Reply to Thread
Results 1 to 5 of 5

Thread: User Disconnect Issues

  1. 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 havenot 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 observedis, 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 screengo 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 RSTissued 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
    wwong@cis.ctc.edu

    * To join/leave the list, search archives, change list settings, *
    * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *


  2. Re: 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:HP3000-L@RAVEN.UTC.EDU] On Behalf
    Of Wong, Wilson
    Sent: Monday, November 10, 2008 1:23 PM
    To: HP3000-L@RAVEN.UTC.EDU
    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
    wwong@cis.ctc.edu

    * To join/leave the list, search archives, change list settings, *
    * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
    No virus found in this incoming message.
    Checked by AVG - http://www.avg.com
    Version: 8.0.175 / Virus Database: 270.9.0/1778 - Release Date: 11/10/2008
    7:53 AM

    * To join/leave the list, search archives, change list settings, *
    * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *


  3. Re: User Disconnect Issues

    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 andlocal user groups and the great camaraderie.

    wilson

    -----Original Message-----
    From: Denys Beauchemin [mailto:denysb@comcast.net]
    Sent: Monday, November 10, 2008 12:21 PM
    To: Wong, Wilson; HP3000-L@RAVEN.UTC.EDU
    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:HP3000-L@RAVEN.UTC.EDU] On Behalf
    Of Wong, Wilson
    Sent: Monday, November 10, 2008 1:23 PM
    To: HP3000-L@RAVEN.UTC.EDU
    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
    wwong@cis.ctc.edu

    * To join/leave the list, search archives, change list settings, *
    * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
    No virus found in this incoming message.
    Checked by AVG - http://www.avg.com
    Version: 8.0.175 / Virus Database: 270.9.0/1778 - Release Date: 11/10/2008
    7:53 AM

    * To join/leave the list, search archives, change list settings, *
    * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *


  4. Re: User Disconnect Issues

    My standard recommendation for these timers as per my testing and working
    with the network professionals at the HP Response Center are:

    Path: NETXPORT.GPROT.TCP


    [Y] Checksum Enabled (Y For Yes, N For No)
    [1024 ] Maximum Number of Connections

    [1 ] Retransmission Interval Lower Bound (Secs)
    [360 ] Maximum Time to Wait For Remote Response (Sec)
    [2 ] Initial Retransmission Interval (Secs)
    [8 ] Maximum Retransmissions per Packet

    [600 ] Connection Assurance Interval (Secs)
    [4 ] Maximum Connection Assurance Retransmissions

    There should be plenty of discussion in the 3000-l archives as per this
    recommendation.

    Regards,
    James Hofmeister

    -----Original Message-----
    From: HP-3000 Systems Discussion [mailto:HP3000-L@RAVEN.UTC.EDU] On Behalf
    Of Wong, Wilson
    Sent: Monday, November 10, 2008 2:37 PM
    To: HP3000-L@RAVEN.UTC.EDU
    Subject: Re: [HP3000-L] User Disconnect Issues

    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

    * To join/leave the list, search archives, change list settings, *
    * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *


  5. Re: User Disconnect Issues

    Sadly, those days are gone and will never return. The days of IT pioneering
    are over. In time, it will be something else. We had a good run, no
    complaints.

    Good luck with your TCP problem and keep us posted.

    Denys...

    -----Original Message-----
    From: Wong, Wilson [mailto:wwong@cis.ctc.edu]
    Sent: Monday, November 10, 2008 4:37 PM
    To: 'Denys Beauchemin'; HP3000-L@RAVEN.UTC.EDU
    Subject: RE: [HP3000-L] User Disconnect Issues

    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:denysb@comcast.net]
    Sent: Monday, November 10, 2008 12:21 PM
    To: Wong, Wilson; HP3000-L@RAVEN.UTC.EDU
    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:HP3000-L@RAVEN.UTC.EDU] On Behalf
    Of Wong, Wilson
    Sent: Monday, November 10, 2008 1:23 PM
    To: HP3000-L@RAVEN.UTC.EDU
    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
    wwong@cis.ctc.edu

    * To join/leave the list, search archives, change list settings, *
    * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
    No virus found in this incoming message.
    Checked by AVG - http://www.avg.com
    Version: 8.0.175 / Virus Database: 270.9.0/1778 - Release Date: 11/10/2008
    7:53 AM

    No virus found in this incoming message.
    Checked by AVG - http://www.avg.com
    Version: 8.0.175 / Virus Database: 270.9.0/1778 - Release Date: 11/10/2008
    7:53 AM

    * To join/leave the list, search archives, change list settings, *
    * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *


+ Reply to Thread