[sudo-users] LDAP problem

[John Berninger]

Gentlefolk -

I have an LDAP-based sudoers configuration that works for RHEL (Red Hat 
Enterprise Linux) 4, RHEL 5, and Fedora clients. On a new RHEL 6 client, 
I'm given the error message:

sudo: no valid sudoers sources found, quitting

I've checked my /etc/ldap.conf file and it contains the correct 
sudoers_base reference.The nsswitch.conf file contains "sudoers: ldap". 
LDAP lookups of users via both ldapsearch and id/getent type commands 
work normally.

Can anyone suggest where I might look next to resolve this?

--
John