Hi, When this happens, in most cases that I've seen the problem is that 'getent shadow', when run as root, doesn't return anything for the users in LDAP. Sudo doesn't really like this. In order to fix it, you need to make sure that the LDAP NSS module is also used for the shadow database.
If that isn't the problem, sudo is pretty thorough in logging when things go wrong, but doesn't provide enough information on stdout or stderr to help debug. The relevant log entries would be found in /var/log/auth.log on a default Debian installation; if more help is needed, please send some relevant entries from an auth.log to this bug log. Thanks, -- The biometric identification system at the gates of the CIA headquarters works because there's a guard with a large gun making sure no one is trying to fool the system. http://www.schneier.com/blog/archives/2009/01/biometrics.html
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