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000045_news@newsmaster….columbia.edu _Mon Sep 21 09:39:13 1998.msg
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From: jaltman@watsun.cc.columbia.edu (Jeffrey Altman)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: unexpected telnet disconnects
Date: 21 Sep 1998 13:39:08 GMT
Organization: Columbia University
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In article <3605E3BC.F1906407@thermeon.com>,
Scott Sampson <ssampson@thermeon.com> wrote:
: Greetings,
:
: Using K95 1.1.17, telnet SRP/CAST encrypted sessions over internet, get
: occasional unexpected disconnects immediately when user types some data
: after sitting idle for several minutes.
:
: I believe I have eliminated keepalive, active close from remote, DUN,
: tcp retransmit timeout, user error, ... from list of possible culprits.
:
: What suggestions do you have to help find the cause? Does Kermit have
: some (default?) rules that may cause disconnects?
:
: Thanks in advance for your assistance, and thanks also for rapid answers
: to previous questions.
K95 does not have any rules that will cause disconnects after idle
time. On a TCP/IP connection, nothing is sent across the wire unless
the user or host application sends data. Therefore, it is possible
for the other end of the connection to disappear or for the TCP route
to become invalid without K95 knowing about it until the user types on
the keyboard.
Another possible problem is associated with DHCP leasing of IP addresses.
If more than one client is assigned the wrong address or if the
Microsoft DHCP client holds an IP address beyond its allocated time.
For these to be diagnoses you will need a sniffer or tcpdump and
record everything until the problem happens.
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