Re: Sessions dropping -- MIDRANGE-L

that looks fine..just checking not something weird. jim

>
> 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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