I've got the cluster installation of OSM and UIM. OSM remotely invokes a web- service on the UIM- side over JMS. UIM responds into the dedicated reply- queue. They talk via store-and-forward agents as recommended by Oracle. Problem is, that the response from UIM might be submitted to any server on the OSM- cluster. If UIM submits the response to the OSM-server which was not a sender of the corresponding request, the message just hangs on in the queue and not been handled.