[14195] in Athena Bugs
ktelnet timeout
daemon@ATHENA.MIT.EDU (Rajiv Aaron Manglani)
Sun Feb 18 02:56:20 1996
Date: Sun, 18 Feb 1996 02:56:24 -0500
To: bugs@MIT.EDU
From: Rajiv Aaron Manglani <rajiv@MIT.EDU>
Cc: yonah@MIT.EDU, ghudson@MIT.EDU, net-help@MIT.EDU
Could someone please look at network help desk ticket #50402. this is related
a problem with authenticated telnet sessions that was introduced in the
original athena 7.7 release and fixed in 7.7L i believe. the problem was
re-introduced in 7.7P (specifically on decs). below is the log from this
ticket #. btw, i'm connecting to alexei.mit.edu, using kclient 1.5 and ncsa
telnet 2.7b4
alexei 5 ~ >> version
Workstation software:
Athena Server (DS5000_100) Version 7.7P Fri Feb 2 05:43:08 1996
SRVD software:
Athena RVD (DECMIPS) Version 7.7P Thu Jan 18 22:10:27 EST 1996
rajiv
2/8/96 @12:18:37 PM - mark - Client has an old DCNS log from the summer
(#12354) (pasted below).
Basically, the client is having the same problem again. The problem is that
the telnetd on his Athena DEC is timing out his Authenticated login from a
PowerMac. It was working for a while, but then the problem resurfaced. I
let him take a look at the way Jenseits was configured, and he said that,
although the Athena version was the same, he thinks that telnetd seemed
different.
He already talked to the Athena consultants on this one, but they referred him
to DCNS. This log was cancelled in the past - is there someone else he should
be talking to?
------ begin pasted log ------
-----------[ Email Log Entry by aafia@9:55:12 AM, 5/3/95]------------------
[14073] daemon@ATHENA.MIT.EDU (Rajiv Aaron Manglani) Network_Help 05/03/95
05:14 (73 lines)
Subject: mac ktelnet problem
Date: Wed, 3 May 1995 06:14:03 -0400
To: "Wilfredo Sanchez Jr." <tritan@calloway.mit.edu>
From: Rajiv Aaron Manglani <rajiv@MIT.EDU>
Cc: net-help@MIT.EDU, mactel@ncsa.uiuc.edu
okay, the problem seems to be a "race condition" where a few things are
going on at the same time. the mac is trying to connect to the telnetd of
the other machine, at the same time the machine is attempting to check the
tickets. the mac forwards its tickets before the machine is ready to
receive them, so they are dropped. then, when it is actually listening, it
doesn't get them so it complains that there is no authentication being
used.
as far as i know, no one in DCNS is working on this because they can't
reliably test it. not to mention that this problem doesn't happen on the
dialups because they are slow. one user mentioned that a solution is to
keep mosaic running on the host machine, to slow it down. another said that
you could try to "nice" the inetd, though that might cause more problems
that it would solve.
I've been using 2.7b1 with few problems. I'm not sure what changes were
made that "fixed" it.
Rajiv
>what mac do you have?
> Quadra 660 AV. 68030, FPU, 24MB RAM, DSP.
hmm. i have an 840AV. no other machines i know of have had this problem.
>system version?
> 7.5
and it happened under 7.1
>kclient or authman version?
> KClient-1.1b1
yup, but i'm using 2.0d2 with Kerberos Telnet plugin 1.1
>telnet version?
> 2.6.1d4 MW 1.1.1.2 (Dec 94)
i've been using 2.7b1 and it works. 2.6.1d1 is the last version i know of
that works. 2.7b2 has a bug where it will always expire your tickets. i
wouldn't suggest using it.
>what machine(s) do you normally try and connect to? which ones to you have
> I try connecting to calloway.mit.edu (my linux box) and
> madman.mit.edu (zeno's maxine).
i connect to alexei, a private dec 5000. do you ever have problems with the
dialups?
>problems with?
> Never finishes opening the connection:
> MIT SIPB Linux-Athena (calloway) (ttyp3)
>
> What you type is not protected.
> You must use the encryption option.
> Works fine w/o encryption or authentication.
yup.
>
>localtalk or ethernet?
> PPP via AI Lab
over modem or ethernet?
===============================================================================
Rajiv A. Manglani rajiv@mit.edu http://www.mit.edu:8001/people/rajiv/
3 Ames Street Cambridge, MA 02142-1363 617.225.6181 800.306.0850
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--[14073]--
------------------------------[ End of Log Entry
]--------------------------------------------
aafia@9:57:05 AM, 5/3/95 --- doesn't seem relevent to the help desk.
cancelling it.
------ end pasted log ------
===============================================================================
Rajiv A. Manglani rajiv@mit.edu http://www.mit.edu:8001/people/rajiv/
3 Ames Street Cambridge, MA 02142-1363 617.225.6181 800.306.0850
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