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It looks like an attempt was made to fix AMQ-2489 with CMS revision 883469. https://issues.apache.org/jira/browse/AMQ-2489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel#issue-tabs http://svn.apache.org/viewvc?view=revision&revision=883469 However, we are still getting the issue with CMS 3.4.0. I am wondering if a mistake was done in the revision below by leaving in the first instance of ackLater. It looks like that should have been replaced with the one called if messageUnackedByConsumer. if( messageUnackedByConsumer ) { this->ackLater( message, ActiveMQConstants::ACK_TYPE_DELIVERED ); } -- View this message in context: http://activemq.2283324.n4.nabble.com/CMS-Could-not-correlate-acknowledgment-with-dispatched-message-MessageAck-tp4084034p4091899.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.