MQ problem med java 7

Jeg sidder med en java applikation der læser/skriver til MQ. Den kører på en java 6. Jeg skal nu have den omlagt til en java7, men får denne fejl:

com.ibm.mq.MQException: MQJE001: An MQException occurred: Completion Code 2, Reason 2059
MQJE011: Socket connection attempt refused
    at com.ibm.mq.MQManagedConnectionJ11.<init>(MQManagedConnectionJ11.java:212)
    at com.ibm.mq.MQClientManagedConnectionFactoryJ11._createManagedConnection(MQClientManagedConnectionFactoryJ11.java:318)
    at com.ibm.mq.MQClientManagedConnectionFactoryJ11.createManagedConnection(MQClientManagedConnectionFactoryJ11.java:338)
    at com.ibm.mq.StoredManagedConnection.<init>(StoredManagedConnection.java:84)
    at com.ibm.mq.MQSimpleConnectionManager.allocateConnection(MQSimpleConnectionManager.java:168)
    at com.ibm.mq.MQQueueManagerFactory.obtainBaseMQQueueManager(MQQueueManagerFactory.java:772)
    at com.ibm.mq.MQQueueManagerFactory.procure(MQQueueManagerFactory.java:697)
    at com.ibm.mq.MQQueueManagerFactory.constructQueueManager(MQQueueManagerFactory.java:657)
    at com.ibm.mq.MQQueueManagerFactory.createQueueManager(MQQueueManagerFactory.java:153)
    at com.ibm.mq.MQQueueManager.<init>(MQQueueManager.java:526)

Caused by: com.ibm.mqservices.MQInternalException: MQJE001: An MQException occurred: Completion Code 2, Reason 2059
MQJE011: Socket connection attempt refused
    at com.ibm.mq.MQInternalCommunications.createSocketConnection(MQInternalCommunications.java:2316)
    at com.ibm.mq.MQv6InternalCommunications$1.run(MQv6InternalCommunications.java:157)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.ibm.mq.MQv6InternalCommunications.initialize(MQv6InternalCommunications.java:154)
    at com.ibm.mq.MQv6InternalCommunications.<init>(MQv6InternalCommunications.java:102)
    at com.ibm.mq.MQSESSIONClient.MQCONNX(MQSESSIONClient.java:1337)
    at com.ibm.mq.MQSESSIONClient.MQCONN(MQSESSIONClient.java:1246)
    at com.ibm.mq.MQManagedConnectionJ11.<init>(MQManagedConnectionJ11.java:184)
    ... 28 more

Jeg håber der er nogen der har en ide om hvad der er galt.
Margit