title: Websphere MQ 7.0 + jars compatible with 5.3 and 6.0 MQSeries servers?
body: <p>I tried connecting jms client with 5.3 / 6.0 MQseries client jars to 7.0+ server, but it threw follwoing exception</p>
  
  <pre><code>com.ibm.mq.MQException: MQJE001: Completion Code 2, Reason 2423
  at com.ibm.mq.MQQueueManager.sequentialConstruct(MQQueueManager.java:904)
  at com.ibm.mq.MQQueueManager.&lt;init&gt;(MQQueueManager.java:865)
  at com.ibm.mq.MQSPIQueueManager.&lt;init&gt;(MQSPIQueueManager.java:83)
  at com.ibm.mq.jms.MQConnection.createQM(MQConnection.java:2009)
  at com.ibm.mq.jms.MQConnection.createQMNonXA(MQConnection.java:1496)
  at com.ibm.mq.jms.MQQueueAgentThread.setup(MQQueueAgentThread.java:306)
  at com.ibm.mq.jms.MQQueueAgentThread.run(MQQueueAgentThread.java:1672)
  at java.lang.Thread.run(Thread.java:570)
  </code></pre>
  
  <p>I do understand from <a href="http://www.ibm.com/developerworks/websphere/library/techarticles/0704_xu/0704_xu.html" rel="nofollow noreferrer">http://www.ibm.com/developerworks/websphere/library/techarticles/0704_xu/0704_xu.html</a> that it's not possible to use previous version client libs. But my question is are these latest client libs backward compatible with 5.3 / 6.0 servers ?</p>