[sudo-users] sudo prompts for roots password

Wed Sep 24 10:44:32 EDT 2008

Sudo version 1.6.8p12
 SUSE Linux Enterprise Server 10 SP1 (x86_64) 

I've noticed this strange behavior on a couple of systems. After joining an Active Directory Domain
Sudo prompts for roots password  instead of the users tough this is not configured
$ sudo -l 
root's password:
User SPTMW01 may run the following commands on this host:
    (ALL) ALL
$grep rootpw /etc/sudoers
- nothing-

any idea

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