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000050_news@newsmaster….columbia.edu _Sun Dec 27 14:34:18 1998.msg
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From: jaltman@watsun.cc.columbia.edu (Jeffrey Altman)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: telnet disconnects
Date: 27 Dec 1998 19:34:15 GMT
Organization: Columbia University
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Message-ID: <76623n$9ep$1@apakabar.cc.columbia.edu>
References: <765q0e$34l$1@samba.rahul.net> <7661fk$93u$1@apakabar.cc.columbia.edu>
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In article <7661fk$93u$1@apakabar.cc.columbia.edu>,
Frank da Cruz <fdc@watsun.cc.columbia.edu> wrote:
: In article <765q0e$34l$1@samba.rahul.net>, <dold@network.rahul.net> wrote:
: : I didn't pay any attention to this one last time the discussion appeared,
: : but now I've got a telnet connection available to my ISP, and it
: : disconnects quite often.
: :
: : The disconnects occur at various periods of idle time, but inconsistent
: : enough that I don't think it is a deliberate timeout.
: :
: : It's happening at work on both C-Kermit 6.0.192 and K95 1.1.17, served
: : through a gateway device to a dial-up PPP.
: :
: : At home, it only seems to happen if I log in through a service called
: : MegaPOP. If I use the direct PPP to my provider (toll call), I'm okay.
: : I looked through the manual (Hey! that's my name ;-)), but I couldn't
: : decide which telnet adjustment I should make.
: :
: Probably none. Debug logs will (with little doubt) reveal that the host is
: closing the connection, but obviously not why it is doing so. Kermit doesn't
: close the Telnet connection unless you ask it to.
The most frequest cause of this kind of disconnect are network errors.
If the TCP/IP stack generates a "Connection Reset" error Kermit disconnects
from the host. This is because the state of the connection is unknown.
A "Connection Reset" error is generated because an unrecoverable loss of
data has occurred. A TCP connection is defined as being reliable and
lossless. Any loss of data MUST be treated as fatal.
Take a debug.log and when the connection breaks, look for ECONRESET,
ENETRESET, ECONNABORTED, ENOTCONN, or "Unknown Error". These are the
error types that will result in a disconnect.
Jeffrey Altman * Sr.Software Designer * Kermit-95 for Win32 and OS/2
The Kermit Project * Columbia University
612 West 115th St #716 * New York, NY * 10025
http://www.kermit-project.org/k95.html * kermit-support@kermit-project.org