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000221_fdc@columbia.edu_Tue Aug 12 14:29:31 EDT 2003.msg
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Article: 14459 of comp.protocols.kermit.misc
Path: newsmaster.cc.columbia.edu!news.columbia.edu!news-not-for-mail
From: fdc@columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Telnet zmodem
Date: 12 Aug 2003 14:29:25 -0400
Organization: Columbia University
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Message-ID: <bhbbm5$rrj$1@watsol.cc.columbia.edu>
References: <WpYZa.2154$u%2.1308@nwrdny02.gnilink.net> <bhapf2$d0a$1@watsol.cc.columbia.edu> <0r9_a.319$jw4.275@nwrdny03.gnilink.net>
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Xref: newsmaster.cc.columbia.edu comp.protocols.kermit.misc:14459
In article <0r9_a.319$jw4.275@nwrdny03.gnilink.net>,
marty <nospam@dontbother.luser> wrote:
: Frank da Cruz wrote:
: > In article <WpYZa.2154$u%2.1308@nwrdny02.gnilink.net>,
: > marty <nospam@dontbother.luser> wrote:
: > : Using: C-Kermit 8.0.209, 17 Mar 2003, for Linux(RH 8.0)
: > : ...
: > : From a C-Kermit prompt I telnet to and log onto the server. The
: > : procedure for downloading via a telnet connection is to choose the
: > : download option and name the file one wishes to download. Chose
: > : xmodem or zmodem (C-Kermit: set protocol zmodem) and the process
: > : begins...
: > :
: > "set protocol zmodem" invokes an external protocol, whatever Red Hat
: > happens to have installed as "rz" and "sz".
:
: Yes I was aware of that fact, thanks.
:
Yes but I didn't know you were aware.
: > : The process finishes with me being dumped back to the C-Kermit prompt.
: > : Status: FAILURE
: > :
: > So "rz" failed.
:
: Actually, I wrongly stated that status reported 'FAILURE'. In fact after
: all of these failed transfers, typing 'Status' at the C-Kermit prompt
: reports: 'SUCCESS'
:
Probably you gave some other command that succeeded after the failed
file transfer and before the STATUS command. From your posting, it's clear
that Kermit reported failure.
: > Some knowledge of serial communication is required. The C-Kermit book has
: > chapters and chapters explaining all this.
:
: Ok, so you would like me to buy your book! Maybe I will, but in the
: meantime your help is greatly appreciated.
:
My point is that it takes a lot of explaining, more than you'd expect me to
type in the response to a newsgroup posting. That's why we wrote the books.
We definitely do not get rich from them.
: > You have to make sure an effective form of flow control is established
: > between every pair of devices along the communication path, e.g. local
: > computer to its modem, modem to modem, remote modem to remote serial
: > port. See:
: >
: > http://www.columbia.edu/kermit/support.html#hints
:
: Thanks for the link but one minor detail I failed to mention. My connection
: to the remote host is via broadband and the Internet, no modem(s) involved.
: I've tried various flow-control settings for both 'tcpip' and 'remote' to
: no avail?
:
Then it's a Zmodem protocol failure, which is prone to happen over Telnet
connections due to Telnet NVT rules, which Kermit obeys but many Zmodem
implementations do not. Some of them might have a command-line option to
force them to adapt to Telnet connections. Kermit protocol would work a
lot better -- you might want to mention this to whoever is in charge of
the other end. Meanwhile, you'll have to look at the rz and sz programs
on your Linux system and see what command-line options are available and
tailor Kermit's SET PROTOCOL command accordingly.
- Frank