We have a script to check if the user is logged in to the nds by checking on the Network address attribute if it has an IP address. But most of the time users are logged in but the Network address attribute is empty. What could be the explanations of this ? We are using a mixed ds structure ranging from 8.7.3.X upwords and the clients are 4.91sp4 and sp5. And as understand there is not any other attribute to use to check if a user is logged in.