su -c user command not working

From: Fernan Aguero (fernan@iib.unsam.edu.ar)
Date: 03/22/02 

Date: Fri, 22 Mar 2002 16:58:17 -0300
From: Fernan Aguero <fernan@iib.unsam.edu.ar>
To: FreeBSD Security <freebsd-security@freebsd.org>

I wonder if this is security related.

Basically I'd like to know if this has been disabled for security
reasons.

According to su(1) you can do something like:
su man -c catman
  Runs the command catman as user man. You will be asked for man's
  password unless your real UID is 0.
        
However, I am refused to run the example in this way (I am root, of
course).

root> su man -c catman
This account is currently not available.

man is listed in /etc/passwd with /sbin/nologin as shell

I'd also like to know why my ~/.cshrc is not read when I log in or
open an xterm. I have to source it every time. Is this also related to
the previous issue (disabled for some reason?)

I am running FreeBSD-4.3 (RELENG_4_3), and except for some minor
things haven't done major configuration or editing of system base
defaults.

Thanks in advance for any help or pointers,

Fernan

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