I have two servers in our TEST environment. One with HSBUS and one with HSREGISTRY. Let's call them "HSBUS01" and "HSDB01" respectively.
Now, I can access HSBUS with my SQL client by using the JDBC driver pointed to hsbus01.full.name.com and port 1972 and specifying a namespace of "HSBUS". I am, however, unable to access the HSREGISTRY instance via SQL with a similar combination of information.