connection refused

[daye]

This is a newbie question:
When I tested ZSI, can not bind.
Thanks.

>>> a = apply(b.average, range(1,11))
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/home/xliu/lib/python/ZSI/client.py", line 28, in __call__
    requesttypecode=TC.Any(self.name, aslist=1))
  File "/home/xliu/lib/python/ZSI/client.py", line 124, in RPC
    self.Send(url, opname, obj, **kw)
  File "/home/xliu/lib/python/ZSI/client.py", line 175, in Send
    self.h.connect()
  File "/usr/lib/python2.2/httplib.py", line 379, in connect
    raise socket.error, msg
socket.error: (111, 'Connection refused')