Persistent Pyro

I am trying to persist a Pyro4 object. I modified the Warehouse example 
to try to store to a Shelve store. My strategy is to duplicate the 
Warehouse instance when it comes time to save it, creating a non 
Pyroized copy which can the be saved. Here are the steps:

1. Created a Warehouse.dup() with:
     n = Warehouse()
     n.contents[:] = self.contents
     return n

2. def save: # calls dup() and stores its non-Pyroized true Warehouse 
instance into the Shelve object.

3. def store: # if name == 'quit', save etc.

Problem: I now get: ConnectionClosedError: receiving: not enough data
The server undoubtedly attempted to close the connection while the 
client held a live instance of Warehouse.

How do I shut down cleanly?

------------------------------------------------------------------------------
Open source business process management suite built on Java and Eclipse
Turn processes into business applications with Bonita BPM Community Edition
Quickly connect people, data, and systems into organized workflows
Winner of BOSSIE, CODIE, OW2 and Gartner awards
http://p.sf.net/sfu/Bonitasoft