I am trying to use the Generic Proxy to get access to NRM on a server

running BorderManager 3.7 with the 3.7 SP2 Builtins.cfg filters.
Previously with NBM 3.6 I could just create a Generic Proxy for 8009
the public interface to 8009 on the private interface of the
BorderManager server and it would work - no messing with filters. I
followed the example in Craig's Filters book.

However, with NBM 3.7 this doesn't seem to work. Can someone tell me

why not and what I have to do to get it to work?