Do you want to allow Anonymous access to the directory? By default, you use the domain Configuration Settings document in the Domino Directory to control anonymous LDAP search access. By default, anonymous LDAP users have Read access to a specific list of attributes.
The Anonymous entry in the directory database ACL by default is set to No Access and controls anonymous access for all users other than LDAP users. If you use an extended ACL, then the Anonymous entry in database ACL, and the extended ACL, then also control anonymous LDAP access. Typically you give the Anonymous entry no more than Reader access.