error of accessing IBM netezza SQL server from pypyodbc on win7

Question

I need to access IBM netezza SQL database from python on win 7. I have installed Eclipse and python 3.2, pydev, and pypyodbc (https://pypi.python.org/pypi/pypyodbc/1.3.3). It worked well for MS SQL server.

But, it got error for IBM netezza.

   import pypyodbc

   conn = pypyodbc.connect("DRIVER={NetezzaSQL};SERVER={my_server_name};DATABASE={my_database};UID=a_user;PWD=apwd")

   pypyodbc.DatabaseError: ('08001', '[08001] Client unable to establish connection')

I can access the database from IBM Aginity workbench without any problems on the same desktop and laptop.

Any help would be appreciated.

thanks !