Closed Telnet Sessions

I have a strange issue that I have not been able to crack. At 10:50am
each and every day all the users that are working (via telnet) on
a redhat 7.1 server are booted off. The receive a message on the
screen that their connection is closed by host.

I cannot find anything giving any indication of what process is
kicking off at that time nor is there anything that indicates that
the users connections are being closed.

This system has run fine for well over a year. The only thing that
has recently changed is that a new firewall (linux) box was added
to the network at around the same time as the problems began
occuring.

I can't provide anymore specific information becasue I do not know
where to begin. I've checked all the possible cron jobs to see
if anything is getting kicked off at that time and there is nothing
anywhere close. /var/log/messages tells me squat more than I already
know.

Well - it doesn't seem as tho there is much interest in this thread
but just in case someone does read it I have narrowed it down to
a DHCP issue. Although it does not make much sense to me.

All the clients are windows 2000 and the default lease time on IP's
is 6 hours. Users telnetted into another Linux server on the
network have their telnet sessions closed when the lease is renewed.
No other processes or network connections a the client level are
disturbed.

So my question is why does renewing the ip lease close the telnet
session?

"Wally Haverschmidt" <(E-Mail Removed)> wrote in message news:<pan.2003.10.03.12.48.28.187809@haverschmidt. com>...
> Well - it doesn't seem as tho there is much interest in this thread
> but just in case someone does read it I have narrowed it down to
> a DHCP issue. Although it does not make much sense to me.
>
> All the clients are windows 2000 and the default lease time on IP's
> is 6 hours. Users telnetted into another Linux server on the
> network have their telnet sessions closed when the lease is renewed.
> No other processes or network connections a the client level are
> disturbed.
>
> So my question is why does renewing the ip lease close the telnet
> session?

That would happen if the renew resulted in the DHCP client getting a
new IP address. In our DHCP environment (ISC DHCPd) clients keep their
IP addresses on a renew.

On Fri, 03 Oct 2003 09:50:17 -0700, Xyerp wrote:


> That would happen if the renew resulted in the DHCP client getting a
> new IP address. In our DHCP environment (ISC DHCPd) clients keep their
> IP addresses on a renew.

Exactly - but that is not the case. I Suppose I should have been
more specific. The lease on the IP is being renewed but is not
changing. I'm wondering if this is somehting specific to windows
since I have no other problem with the clients connections at the
point the lease renews. The only effect is any open telnet sessions
FROM windows clients TO the linux server get disrupted.