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000087_news@newsmaster….columbia.edu _Thu Oct 1 08:23:24 1998.msg
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From: jaltman@watsun.cc.columbia.edu (Jeffrey Altman)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Telnet disconnect
Date: 1 Oct 1998 12:23:22 GMT
Organization: Columbia University
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In article <F04wA5.DqL@cix.compulink.co.uk>,
Lygo Systems <lsystemsd@cix.compulink.co.uk> wrote:
: Telnet disconnection due to reboot.
:
: I have a number of users connecting with MS-DOS Kermit telnet sessions
: into Redhat Linux (4.2 & 5.1). If they close the connection with the
: normal Kermit exit command without first logging off, then the telnet
: session is closed on Linux which is just what I want. If, however, they
: reboot their PC with ALT CTL DEL then the session stays active.
:
: The reason that this is a problem is that they are running the Pick/D3
: database which has a limited number of active users allowed to be logged
: on at the same time. If they reboot their PC then that will effectively
: lose one user unless the previous session is automatically logged off.
: Pick has a couple of commands that in theory should deal with the
: situation: DCD-ON and TRAP DCD EXIT. In other words if DCD is lost then
: the session should be automatically closed. But it ain't happening...
:
: This is not a Pick specific problem because the same thing happens if they
: just log into Linux. I don't know if it's a Kermit problem as the
: same thing happens with another Telnet client that I use.
:
: Any suggestions would be gratefully received.
:
: Bill.
The problem is not in Kermit. The problem is that there is no way
for a TCP/IP application to determine that the other end of the
socket is no longer valid unless it attempts to send data.
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