su root: 'incorrect password' / RH 9

[martti pitkanen <martti pitkanen aplcomp fi>]

Hi,


After installing all sp:s for RH9, I came across a root authorization 
problem:
As a regular user, I open 'Konsole - Super User Mode'. RH9 does not
accept root password. Anyway, I can boot as a 'root' without problem. 
(runlevel 5)
After having booted as 'root', I 'su regular-user', in xterm window.
Then I 'su root' in the same windoe, which produces the above error,
i.e. I cannot return to 'root', even though I've booted as 'root' 
originally.
Pls. see below the applicaple 'messages' -snippet:

Nov  6 15:28:12 Fuji2 su(pam_unix)[11527]: session opened for user root by 
root(uid=0)
Nov  6 15:28:17 Fuji2 su(pam_unix)[11554]: session opened for user 
regular-user by root(uid=0)
Nov  6 15:28:23 Fuji2 su(pam_unix)[11581]: authentication failure; 
logname=root uid=500 euid=500 tty= ruser=regular-user rhost=  user=root

Authentication:
Use Shadow Passwords = yes
Use MD5 Passwords = Yes
all other selections = no


--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/