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AuthorForum: PowerVT
Topic: Extraneous Logout Using Telnet
User1094

Posts: 1
Member Since: 10/27/00
posted October 27, 2000 8:46 AM

Users telnetted in to a HP UX machine are
being disconnected intermittenly for no reason.
We have checked idle timer on HP UX and this
is not the issue.
Any Ideas?
Thanks
Tony Priest



From: Utica, NY USA
Posts: 8466
Member Since: 04/11/00
posted October 27, 2000 9:33 AM


We have an HP-UX machine here. Please tell me how to duplicate this.

User1093

Posts: 1
Member Since: 10/27/00
posted October 27, 2000 10:34 AM

Tony,
I'm working with Dan on this. We can't duplicate it at will. The configuration is as follows. HPK580 running 10.2 in the US, international frame -relay connection - client PC on a LAN in Dublin. We are attempting to "catch" one of these disconnects with a probe, but to date we cannot determine if the host or client causes the "Connection Closed" message on the status bar. Link utilization is not high during drops and we have many users here in the US that maintain the connection. Dublin users using PowerVT 2.1.4. What other information would be useful. - Tony
N/A posted October 27, 2000 10:36 AM

More - info. During some disconnects the user is actually typing into an Oracle app. - Tony
Tony Priest



From: Utica, NY USA
Posts: 8466
Member Since: 04/11/00
posted October 27, 2000 10:45 AM


I'm sorry but none of this is much help to me. It sounds to me like the server is disconnecting for some reason.
N/A posted October 27, 2000 11:19 AM

Other than the user "Clicking on the X" or logging out from the host, how could the PowerVT client telnet session end. Does the telnet session require a response within X ms? Are there ways to adjust any timeouts? Thanks - Tony

Tony Priest



From: Utica, NY USA
Posts: 8466
Member Since: 04/11/00
posted October 27, 2000 11:20 AM


The server may have closed the connection.

N/A posted October 27, 2000 11:25 AM

I'm not sure how to identify how or why the "host" would drop the connection. But, do you under which circumstances the "client" would drop the connection? - Tony
Tony Priest



From: Utica, NY USA
Posts: 8466
Member Since: 04/11/00
posted October 27, 2000 11:28 AM


No, I don't. Sorry.

N/A posted October 27, 2000 11:41 AM

By "I don't know", I assume you mean to your knowledge the timeout parameters don't exist.
Please clarify this last point and thank you very much for effort in the matter. - Tony
Tony Priest



From: Utica, NY USA
Posts: 8466
Member Since: 04/11/00
posted October 27, 2000 12:57 PM


What I mean is that I have no idea why the connection is being closed. It's not something I can tell without seeing it for myself.

pcalvert

From: Earby, United Kingdom
Posts: 2
Member Since: 10/24/07
posted October 24, 2007 8:31 AM

I can add some more information to this call, I realise it's now 7 years old but could give an answer to the issue.

The issue as we have found it as well is with TCP keepalive packets, the session coming across the transatlantic backbone invariably will go through several routers, the timeout of the session is set in the keepalives of the router, the default timeout of 30mins on a Cisco router for session inactivity is according to the RFC standard practise to help stop DOS attacks on open TCP ports.

There is a work around to keep the session open which we have found on other emulators which is to send a null TCP keepalive packet which allows the session to stay open without traffic and has no impact on user performance and only slight impact on network performance.

I don't however know if the emulator supports null keepalive session packets, thats one for the development team......

Over to you guys????
Amit

From: Rome, NY USA
Posts: 315
Member Since: 03/15/06
posted October 24, 2007 3:55 PM

Hello,

It seems that you have posted this issue in the wrong forum as you are using Emulation Active X and Emulation .NET controls.
You are absolutely right that the null KeepAlive packets allow the session to remain open.
The PowerVT does not have KeepAlive capabilities however Telnet Active X as well as .Net does have a KeepAlive property.

I hope this is of help.

Best Regards,
Amit

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pcalvert

From: Earby, United Kingdom
Posts: 2
Member Since: 10/24/07
posted October 25, 2007 4:55 AM

My appologies for posting in the wrong area, but can you please confirm that telnet active x is the same as emulation active x in it's support for keepalives.

Also if this is the case can you please let me know where these keepalives can be set.

Thanks
Amit

From: Rome, NY USA
Posts: 315
Member Since: 03/15/06
posted October 25, 2007 4:46 PM

Hello,

First of all, you have to modify the registry so that it support KeepAlive packets. Here is a link which provides some information on the same:
http://www.pctools.com/guides/registry/detail/891/

After this, you need to set controlís KeepAlive property to true.
Yes, Telnet Active X also has a support for KeepAlive.

Best Regards,
Amit

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