Before we explore any further, a couple of quick questions:
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What version of Glassfish are you using?
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You mentioned you were using a Glassfish cluster. What "broker type" are your instances using? LOCAL, REMOTE or EMBEDDED?
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(It you aren't sure, this is logged in the server log of each instance during startup. Look for a message of the form
<br/><tt>MQJMSRA_RA1101: SJSMQ JMSRA Started:LOCAL</tt>)
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Nigel
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