We are having problems with JbossCache v1.4.1.SP9 and JGroups 2.4.1 in Websphere 6.1 cluster environment.

Randomly, we get the following errors in the log:
JChannel I org.jgroups.JChannel handleExit received an EXIT event, will leave the channel
JChannel I org.jgroups.JChannel$CloserThread run closing the channel
NAKACK W org.jgroups.protocols.pbcast.NAKACK handleMessage node1] discarded message from non-member node1, my view is MergeView::[node1|30] [node1, node2], subgroups=[[node1|0] [node1], [node2|29] [node2]]

Also we get:
NAKACK W org.jgroups.protocols.pbcast.NAKACK send [node1] discarded message as start() has not been called, message: [dst: , src: (1 headers), size = 146 bytes]

The cluster has 2 nodes which are called node1 and node2 for simplicity in the post.

After a couple of seconds in which node1 continues throwing those messages, we get:
GMS W org.jgroups.stack.Protocol receiveDownEvent exception: QueueClosedException
ProtocolStack E org.jgroups.stack.ProtocolStack down no down protocol available !
...
UNICAST W org.jgroups.protocols.UNICAST setProperties window_size is deprecated and will be ignored
UNICAST W org.jgroups.protocols.UNICAST setProperties min_threshold is deprecated and will be ignored
FRAG2 I org.jgroups.protocols.FRAG2 setProperties frag_size=8192, overhead=200, new frag_size=7992
...
UDP I org.jgroups.protocols.UDP createSockets sockets will use interface node1
UDP I org.jgroups.protocols.UDP createSockets socket information:
local_addr=node1, mcast_addr=228.2.2.2:45522, bind_addr=/node1, ttl=64
sock: bound to node1, receive buffer size=131071, send buffer size=131071
mcast_recv_sock: bound to node1, send buffer size=131071, receive buffer size=131071
mcast_send_sock: bound to node1, send buffer size=131071, receive buffer size=131071
SystemOut O
-------------------------------------------------------
GMS: address is node1
-------------------------------------------------------
TreeCache I org.jboss.cache.TreeCache viewAccepted viewAccepted(): [node10] [node1]
JChannel I org.jgroups.JChannel$CloserThread run fetching the state (auto_getstate=true)
JChannel I org.jgroups.JChannel$CloserThread run state transfer failed

And no more messages for node1. In node2 we have no special messages of this problem.

The configuration file of jbosscache is:

<UDP mcast_addr="228.2.2.2" mcast_port="45522"
ip_ttl="64" ip_mcast="true"
mcast_send_buf_size="150000" mcast_recv_buf_size="2000000"
ucast_send_buf_size="150000" ucast_recv_buf_size="2000000"
loopback="false"/>
<PING timeout="2000" num_initial_members="2"
up_thread="false" down_thread="false"/>
<MERGE2 min_interval="10000" max_interval="20000"/>
<FD timeout="10000" shun="true" up_thread="true" down_thread="true"/>
<VERIFY_SUSPECT timeout="1500"
up_thread="false" down_thread="false"/>
<pbcast.NAKACK gc_lag="50" retransmit_timeout="600,1200,2400,4800"
up_thread="false" down_thread="false" discard_delivered_msgs="true"/>
<pbcast.STABLE desired_avg_gossip="20000"
up_thread="false" down_thread="false" max_bytes="250000"/>
<UNICAST timeout="600,1200,2400" window_size="100" min_threshold="10"
down_thread="false"/>
<FC max_credits="500000" down_thread="false" min_threshold="0.25"/>
<FRAG2 frag_size="8192"
down_thread="false" up_thread="false"/>
<pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
shun="true" print_local_addr="true"/>
<pbcast.STATE_TRANSFER up_thread="false" down_thread="false"/>


I will appreciate any help. Thanks.