You need to use this option -Dvbroker.se.iiop_tp.scm.iiop_tp.listener.port. So to start the Naming Service at a particular port, you need to do the following vbj -Dvbroker.se.iiop_tp.scm.iiop_tp.listener.port= \ com.inprise.vbroker.naming.ExtFactory NS531-Why is there no 1-1 correspondence between the CosNaming Directory structure and the Netscape LDAP directory structure when the backing store is JNDI/LDAP? In fact, almost all the entries in Netscape LDAP are organised into a flat directory structure. What you are seeing is correct. We know it is reasonable to expect to see a mirror image of the CosNaming hierarchical structure in LDAP. But this is not possible because the directory model used by LDAP is very different from CosNaming. (1) In CosNaming, the directory tree can be broken up into several physically separate “islands” where you cannot navigate from one context in one island to another context of another context. For example, you can unbind a cont