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000280_news@columbia.edu_Sun Sep 3 11:44:30 1995.msg
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From: jrd@cc.usu.edu (Joe Doupnik)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: MS-KERMIT 3.14 hanging on idle TCP/IP connection?
Message-Id: <1995Sep3.174430.60473@cc.usu.edu>
Date: 3 Sep 95 17:44:30 MDT
References: <42d2u9$edt@apakabar.cc.columbia.edu>
Organization: Utah State University
Lines: 56
Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <42d2u9$edt@apakabar.cc.columbia.edu>, chaiklin@merhaba.cc.columbia.edu (Seth Chaiklin) writes:
> PROBLEM #1: If I leave MS-DOS machine running Kermit idle for
> (let us say) 15 minutes, then the terminal stops showing
> input and output.
>
> PROBLEM #2: After reaching the state described in Problem #1, it
> is no longer possible to start other TCP/IP sessions.
>
> PROBLEM #3: Upon exiting kermit, the PC machine freezes up,
> requiring a Control-Alt-Del, and sometimes a power-down. In general,
> it seems that the problem reappears if one does NOT use a power-down.
>
> I have read the kermit.hlp and kermit.bwr but remain unenlightened.
>
> BACKGROUND:
>
> 1. I have been using MS-KERMIT 3.14pl9 to connect from MS-DOS
> machines (486 w/ MS-DOS 6.22 and a XT w/MS-DOS 5.0 and ANSI.SYS) to a
> Linux machine. All the involved machines have 3Com ethernet cards,
> and all three are located on a TCP/IP ethernet with about one meter
> distance between them.
>
> 2. I am positive that the problem is not the Kermit has dropped the
> connection. Because the machines are setting next to each other, I
> can look at the Linux machine and see what program is being run on the
> "hung" machine running Kermit. I can also "logout", etc.
>
> 3. I have tried SET TERM RESET, Alt-=, set term none, and anything
> else I could find in kermit.hlp that seemed relevant, but this
> did not help.
>
> 4. As mentioned above, when exiting, the PC freezes. As suggested
> in KERMIT.BWR, it is possible to push to DOS, etc., while the
> session is still running, but hangup and exit result in the PC crash.
>
> I can provide more information if the preceding was not sufficient.
>
> Thanks for any advice/help/suggestions.
>
> Cheers,
> Seth Chaiklin
---------------
Did you have a chance to look at the ARP cache on the Linux machine?
I've heard rumors (I don't use Linux) that it times out and can yield just
the effects noted. You might try pinging MSK from the Linux end as one way
of correcting its ARP cache.
The situation seems to be Kermit is getting no response to its IP
transmissions and it is doing backed off retries (as per TCP specs). Control
should return when the retries are successful or exhausted.
You should also double check memory management on the PC to avoid
clobbering the Ethernet adapter (presumed, you didn't say), and also to
seek out and destroy IRQ & port conflicts. Remember to leave video memory,
segments A000-BFFF, to the video system. These matters are discussed in
the release notes. Do worry about PC screen savers and green machine
power-downs too.
Joe D.