James Hofmeister ([log in to unmask]) wrote:
> Hello Friends,

> : [log in to unmask] wrote:
> : >
> : > Twice within the past month my 967 has dropped several VT sessions.  My
> : > network guy says nothing is wrong with the network, and in fact while the
> : > 3000 is dropping VT's, I can still communicate with our NT servers, our
> : > 9000 box, etc.  The last time it did this (yesterday) it dropped about 50
> : > VT
> : > connections, but I personally had 3 sessions running that never gliched.

We're having the same problem here across three Telnet Express boxes. The
problem appears to be related to router load (CPU utilization and/or traffic).
We can recreate the problem by telling the network management station to
discover new nodes which intermitently drives router CPU utilization up to
near 100%. Other applications don't seem to be affected although things
slow down.

A protocol analysis of the tail end of the occurance showed the Telnet
Express box ignoring packets from the PC and then finally responding
with a RST packet which closed the connection.

> 1. First look for PCs with Duplicate IP addresses -  A very common symptom
>    is a VT connection will be dropped with VTERR 42 and be able to restart
>    and re-establish their connection immediately.

>    This is a common problem seen when a NEW pc is installed and the s/w
>    is copied from PC to PC including the configuration....  when the new
>    PC is booted into the network software the OLD pc looses it's TCP
>    connection... User reboots the OLD pc and now the new pc looses it's
>    TCP connection...

There don't appear to be any duplicate IP addresses. We use bootp address
assignments. Windows 95 will sometimes keep the old IP address when things
change but I ran an HP Network Advisor Fault Finder on the affected areas
and no duplicate IP addresses were flagged during the time of the problem.
We also double checked the individuals involved.

> 2. Look for VTERR messages in the NM Log files...  I have not heard of any
>    cases where a VT connection went away with out a error message.

I passed this suggestion along to our system manager as I'm not sure
where these log files are kept.

Thanks for your response to the original poster's problem. :-)

I'll post here if we find something further. I'm wondering if the
Telnet Express box's TCP implementation is less robust than
other devices (PCs, 9000s, etc.).

--
Gary Flynn
Network Manager
James Madison University
Harrisonburg, Virginia
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