When both the servers are up and running, one pause (either cause by a GC or a network glitch) causes server2 to start the HA Singleton object and also bind the JMS Queues and Topics. At this point both the servers are running as primaries.

(Note regarding the pause: We are monitoring the GC collections using JConsole. Only the ParNew collections have taken place, the ConcurrentMarkSweep collection has not yet taken place).

After a couple of minutes, both the servers communicate, and server1 reestablishes as the sole primary in the cluster. But the HA Singleton, JMS Queues and Topics created in server2 remains and is not unbound.

The sequence of events:
Log message from server1:
2009-04-22 17:16:11,251 org.jgroups.blocks.BasicConnectionTable$Connection._send(BasicConnectionTable.java:443) WARN [org.jgroups.blocks.ConnectionTable] peer closed connection, trying to re-send msg
2009-04-22 17:16:11,252 org.jgroups.blocks.BasicConnectionTable$Connection._send(BasicConnectionTable.java:449) ERROR [org.jgroups.blocks.ConnectionTable] 2nd attempt to send data failed too

Log message from server2
2009-04-22 17:15:42,828 org.jboss.ha.framework.server.HAPartitionImpl.suspect(HAPartitionImpl.java:584) INFO [org.jboss.ha.framework.interfaces.HAPartition.CUSTOMPartition] Suspected member: server1:7800
....
2009-04-22 17:15:42,940 org.jboss.ha.framework.server.DistributedReplicantManagerImpl.membershipChanged(DistributedReplicantManagerImpl.java:374) INFO [org.jboss.ha.framework.server.DistributedReplicantManagerImpl.CUSTOMPartition] Dead members: 1 ([server1:1199])
2009-04-22 17:15:42,941 org.jboss.ha.framework.server.DistributedReplicantManagerImpl.membershipChanged(DistributedReplicantManagerImpl.java:375) INFO [org.jboss.ha.framework.server.DistributedReplicantManagerImpl.CUSTOMPartition] New Members : 0 ([])
2009-04-22 17:15:42,941 org.jboss.ha.framework.server.DistributedReplicantManagerImpl.membershipChanged(DistributedReplicantManagerImpl.java:376) INFO [org.jboss.ha.framework.server.DistributedReplicantManagerImpl.CUSTOMPartition] All Members : 1 ([server2:1199])
.....
2009-04-22 17:16:11,255 org.jgroups.protocols.pbcast.NAKACK.handleMessage(NAKACK.java:668) WARN [org.jgroups.protocols.pbcast.NAKACK] server2:49665] discarded message from non-member server1:57210, my view is [server2:49665|2] [server2:49665]
2009-04-22 17:16:11,259 org.jgroups.protocols.pbcast.NAKACK.handleMessage(NAKACK.java:668) WARN [org.jgroups.protocols.pbcast.NAKACK] server2:49663] discarded message from non-member server1:57208, my view is [server2:49663|2] [server2:49663]
.....
2009-04-22 17:16:13,877 org.jboss.cache.TreeCache.viewAccepted(TreeCache.java:5687) INFO [org.jboss.cache.TreeCache] viewAccepted(): [server2:49663|3] [server2:49663, server1:57824]