Clement, Thank you for all you help so far. Sorry for being a pain but I see that that the timestamp on the master server and the slave servers are different for some users. Is this like some catch for the overlay or is it a issue that can be fixed?
Thanks a lot
Date: Fri, 9 Nov 2012 09:47:56 +0100
Subject: Re: Lastlogon attribute
2012/11/8 jeevan kc <firstname.lastname@example.org>
The attribute is created after the first BIND. Maybe some of your users did not authenticate since you enabled the overlay.