For completeness, this is the trace on the sending machine when I use TCP instead of UDP: 2007-03-27 11:14:14,095 TRACE [org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] Partition DefaultPartition received msg | 2007-03-27 11:14:14,096 TRACE [org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] pre methodName: FarmMemberService.farmDeployments | 2007-03-27 11:14:14,096 TRACE [org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] handlerName: FarmMemberService methodName: farmDeployments | 2007-03-27 11:14:14,096 TRACE [org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] Handle: FarmMemberService.farmDeployments | 2007-03-27 11:14:14,096 DEBUG [org.jboss.ha.framework.server.FarmMemberService] farmDeployments request, parentDUMap.size=1 | 2007-03-27 11:14:14,097 TRACE [org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] rpc call return value: {farm/kusssdemo.ear=Mon Mar 26 17:14:03 CEST 2007} | 2007-03-27 11:14:14,123 TRACE [org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] Partition DefaultPartition received msg | 2007-03-27 11:14:14,129 TRACE [org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] pre methodName: org.jboss.ha.framework.server.ClusterFileTransferService.remotePullOpenFile | 2007-03-27 11:14:14,129 TRACE [org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] handlerName: org.jboss.ha.framework.server.ClusterFileTransferService methodName: remotePullOpenFile | 2007-03-27 11:14:14,129 TRACE [org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] Handle: org.jboss.ha.framework.server.ClusterFileTransferService.remotePullOpenFile | 2007-03-27 11:14:14,139 TRACE [org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] rpc call return value: org.jboss.ha.framework.server.ClusterFileTransfer$FileContentChunk@2ef8e535 | The file is requested, openend and consequentally transferred and successfully deployed on the other machine and the clustered application works fine. Is it possible that 'I'm hitting a bug with the UDP configuration here? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4031961#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...