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From root@hpss1.ccs.ornl.gov  Mon Aug  4 15:32:44 1997
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Date: Mon, 4 Aug 1997 15:32:27 -0400
From: root@hpss1.ccs.ornl.gov
Reply-To: root@hpss1.ccs.ornl.gov
To: krb5-bugs@MIT.EDU
Subject: telnetd causes terminal windows to hang
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>Number:         454
>Category:       telnet
>Synopsis:       telnetd causes terminal windows to hang
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    hartmans
>State:          closed
>Class:          sw-bug
>Submitter-Id:   unknown
>Arrival-Date:   Mon Aug 04 15:33:01 EDT 1997
>Last-Modified:  Fri Sep 14 17:47:24 EDT 2001
>Originator:     Dan Million
>Organization:
	Oak Ridge National Laboratory
>Release:        1.0pl1
>Environment:
	IBM RS/6000 model 580, AIX 4.1.4
System: AIX hpss1 1 4 000041156600


>Description:
	When we use the Kerberos telnetd, remote users logging into our
	machine have their terminal windows hang.  Typing a command like
	"su root" will do this every time.  Sometimes just a control-C
	will do it.

	I've run telnetd in debug mode, and it appears that the connection
	is not really hung; characters are going over the network.  But none
	of them are visible on the terminal window.

	We can't implement our plans to use Kerberized telnet as long as
	this situation holds!

	Another (possibly related) problem is that frequently telnet sessions
	go away and a "login" process is still running on our machine.  We
	tend to accumulate a dozen or so of these disconnected login processes,
	and I have to become root and kill them by hand.

>How-To-Repeat:
	More or less described above:  install Kerberos version of telnetd;
	modify /etc/inetd.conf to replace standard telnetd.  Then telnet
	to machine where the Kerberos telnetd is installed, using either
	Kerberos telnet or plain ol' telnet.  Type a control-C or a "su"
	command, and watch the terminal window go dead.
>Fix:
	None known.
>Audit-Trail:

State-Changed-From-To: open-closed
State-Changed-By: tlyu
State-Changed-When: Fri Sep 14 17:46:53 2001
State-Changed-Why:
Believed to be a known problem related to revoke() on older versions
of AIX.

>Unformatted: