V5 Messaging Provider with ListenerPort

Question

I configured a queue and a QueueConnectionFactory using the V5 Messaging provider in WAS6.1. I also have a ListenerPort configured for this destination. Now it throws an exception when I try to connect to this queue using the queue connection factory or when the Message Listener listening to this ListenerPort starts up.

javax.jms.JMSException: MQJMS2005: failed to create MQQueueManager for 'localhost:WAS_Node01_server1'

and the nested exception is

com.ibm.mq.MQException: MQJE001: An MQException occurred: Completion Code 2, Reason 2059 MQJE011: Socket connection attempt refused

Can someone please point me to what possibily could have gone wrong in configuring the queue and queue connection factory?

Thanks