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000250_news@columbia.edu_Sun Oct 29 08:34:51 1995.msg
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From: jrd@cc.usu.edu (Joe Doupnik)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Kermit freezes when inactive
Message-Id: <1995Oct29.143451.65294@cc.usu.edu>
Date: 29 Oct 95 14:34:51 MDT
References: <470nsi$c7e@huron.eel.ufl.edu>
Organization: Utah State University
Lines: 34
Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <470nsi$c7e@huron.eel.ufl.edu>, afn10375@afn.org (David A. Johns) writes:
> Has anyone seen anything like this?
>
> I'm operating MS-Kermit 3.14 over a network running TCP/IP. It
> communicates through an ethernet card with a packet driver and
> winpkt.com. Sometimes I call it up from DOS and sometimes in a DOS
> window under Windows 3.1.
>
> Fairly regularly if I'm logged into a remote host, if I let the
> connection sit idle for a while, when I try to use it, it's frozen.
> Kermit itself is not frozen, since I can escape to the command line and
> even use other sessions. If I give the hangup command, however, the
> cursor will move back to the beginning of the command line and Kermit will
> lock up solid. If I'm in DOS, I have to reboot. If I'm in Windows, I
> can ctrl-alt-del back to Program Manager, but no program will be able to
> access the network until I reboot the computer (if I restart Kermit, it
> will not connect, and Trumpet winsock will not start up).
>
> I also use MSKermit to connect to these same hosts from home over a phone
> line, and this lockup never happens. It is not being caused by an
> inactivity time-out at the other end. It only happens with MSKermit; I
> also use various winsock-based telnet clients, and have never had this
> happen.
>
> Does anyone have a clue? I don't, and I'd sure appreciate one.
------------
The clue resides in the other half of the connection story: the
remote host. If that host happens to be a Linux system then please be
aware that some such lose their ARP cache and fail to communicate after
the timeout. You should also get 21 May 95 edition of MSK if you don't
have it (kermit.columbia.edu, cd kermit/msdos, binary file msvibm.zip).
The "lockup" is waiting for the other end to respond to a proper
TCP segment, and the timeout can be a couple of minutes.
Joe D.