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/usr/bin/who shows logged-out users

Recently I have noticed (legitimate) users logged in on one of our
servers with no processes running.

I know for a fact that they log into the server via (open)ssh, and
eventually close the ssh connection.  These are all current potato
systems with 2.2.17pre6 as kernel.

Nonetheless, <who> still shows them as still logged on (as does <last>). 
On the other hand, <w> does not show them as logged on.

Is there a way to get /var/log/wtmp to update itself?  Any ideas what
the cause of this might be? (ssh shutting down impoperly?)

It's not a huge problem, but an annoyance.

Thanks for any input


Thomas R. Shemanske                
(Mailing Address)                  (Office/Internet Information)
Department of Mathematics          203 Choate House
6188 Bradley Hall                  thomas.r.shemanske@dartmouth.edu
Dartmouth College                  http://www.math.dartmouth.edu/~trs/
Hanover, NH 03755-3551             (603) 646 - 3179 
Directions:  http://www.math.dartmouth.edu/~trs/choatehouse.html
Office hours: 

Summer Term Office Hours:  By appointment

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