Re: Sessions dropping -- MIDRANGE-L

keep alive is 120.
telnet is *CALC.
QINACTITV is *NONE.
QINACTMSGQ is *DSCJOB (not that is matters here).
QDSCJOBITV is 300.

-----Original Message-----
From: "Jim Franz" <franz400@xxxxxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Date: Thu, 11 Sep 2003 10:22:27 -0400
Subject: Re: Sessions dropping

> Can you post your TCP Keep Alive value (from CHGTCPA),
> your Telnet timeout values(CHGTELNA), and your inactive job system
> values(DSPSYSVAL)?
> also verify some network device/server not on a scheduled reboot (like
> i
> have a customer who
> reboots their Terminal Server every day on her way out the door (and
> drops
> any remote users)..
> jim
> ----- Original Message ----- 
> From: "Uros Davidovic" <Uros_Davidovic@xxxxxxxxxxx>
> To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>;
> "Scott Klement" <klemscot@xxxxxxxxxxxx>
> Sent: Thursday, September 11, 2003 9:38 AM
> Subject: Re: Sessions dropping
> 
> 
> >
> > >
> > > > We have had users that have had session drop for no apparent
> reason.
> > > The
> > > > sessions go to a black screen, the 400 job is still out there and
> it
> > > the
> > > > old "session stopped per request from the device" message is in
> the
> > > > joblog. It seems to happen at approximately the same time every
> day
> > > and
> > > > all of the TCP settings look fine.
> > >
> > > Is there something that runs at that time every day?
> >
> > Not to the best of my knowledge. The network folks cannot think of
> > anything and there is nothing on the iSeries.
> > >
> > > > The only change to the network setup was a recent change to the
> DHCP
> > > > service (details of which I do not know)  and even session that
> are
> > > > configured to go to the actual IP, not the name, drop.
> > >
> > > This could be a DHCP issue.   The PC may be having it's lease
> revoked
> > > at
> > > that time every day.
> > >
> > Actually, I understand the difference, even though it may not be
> evident
> > from the statement. Going through the archives before posting this, I
> did
> > find the DHCP lease expiration issue on a similar post and trying the
> > name vs. the IP was because one of the network folks mentioned they
> did
> > not have a internal DNS server. Just wanted to see if it made a
> > difference and if the dropping sessions would have anything in
> common,
> > like they are all setup to connect to a name.
> >
> > > Based on this statement "even session that are configured to go to
> the
> > > actual IP, not the name, drop"  it appears that you have gotten
> DHCP
> > > and
> > > DNS confused.
> > >
> > > DNS takes a name, and converts it to an address.   If something
> would
> > > change with DNS, it would not affect clients that are connecting
> > > directly
> > > with the IP Address.
> > >
> > > DHCP, however, is what assigns the PCs their IP addresses (often
> based
> > > on
> > > the Ethernet MAC address) and has nothing to do with the names at
> all.
> > > If DHCP is making the computers change their IP address, you'll
> have
> > > the
> > > problem that you've described above.   Why?  Because the TCP
> connection
> > > that the TN5250 session is running in relies on two sets of
> addresses,
> > > one
> > > for the PC and one for the AS/400.  If one or the other of those
> > > addresses
> > > changes, the connection will stop working and eventually time out.
> > >
> > >
> > > > I tested 4 sessions on one PC, two dos telnets to name and IP and
> two
> > > CA
> > > > sessions to IP both and only one session dropped... Per the
> network
> > > > folks, there is no inactivity/latency setting on the router that
> > > these
> > > > go to...
> > >
> > > As I said, this could be happening when the DHCP lease is renewed,
> if
> > > the
> > > PC stops communicating with the iSeries for a second, and that
> happens
> > > to
> > > be when the iSeries sends it's keepalive packet, it'll reset.
> > >
> > > I was thinking also that the PC might be resetting it's TCP stack
> at
> > > that
> > > time, but if some of the sessions are surviving, then that's not
> the
> > > case.
> > >
> > > >
> > > > Any clues?
> > > >
> > >
> > > Try changing the DHCP lease time to be an hour or two longer and
> see if
> > > that helps, or changes what time the disconnects happen.   If they
> > > start
> > > happening an hour later, you know that the DHCP lease is where the
> > > issue
> > > is.
> > >
> > > If that doesn't help, then you may have a hardware problem.   Not
> sure
> > > why
> > > that would happen at a regular interval, but it might be due to a
> power
> > > fluctuation or something that happens at that time every day.
> > >
> > > That's all I can think of, right now.
> >
> > I also thought of a hardware problem, but the problem is sporadic and
> > happens to a lot of PCs. The only thing in common is the router, as I
> > said, but per the network folks it has been up for days with no
> issues
> > that they can see...
> >
> > I will see if I can try the static IP thing and see what the lease
> > expiration interval is, there probably is one, due to the security
> > restrictions the company has.
> >
> > Thanks for the help, Scott...
> >
> > > _______________________________________________
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> >
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> 
> 
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