I followed the actionlib tutorial given here and created fibonacci_server.py and fibonacci_client.py which I have attached. If I run roscore on the same computer as I'm running the server and client, the whole connection (server-client) works and I am able to echo the feedback, status, result etc. However, when I run roscore on a remote machine i.e. a remote ROS master by setting my ROS_MASTER_URI, the process does not work. I even made sure that they have the same time by running ntpdate on both machines. 

Both computers are running Ubuntu 12.04 with ROS Groovy. Is there something more I need to do in order to make the action server work with a remote ROS master? Please let me know if you need more information and thanks for your help.

Sudarshan.