Here is the current config I am using. We have 2 jboss clusters running on tomcat app server and three different machines. And every few days or so we get issue with cache being out of synch. Aur cache size seems to be around 1.2 MB in size. Do you have any suggestions for the config below ? <UDP mcast_addr="224.0.0.100" mcast_port="48866" bind_addr="192.168.13.100" ip_ttl="64" ip_mcast="true" mcast_send_buf_size="150000" mcast_recv_buf_size="80000" ucast_send_buf_size="150000" ucast_recv_buf_size="80000" loopback="false" /> <PING timeout="2000" num_initial_members="3" up_thread="false" down_thread="false" /> <MERGE2 min_interval="10000" max_interval="20000" /> - <!-- <FD shun="true" up_thread="true" down_thread="true" /> --> <FD_SOCK /> <VERIFY_SUSPECT timeout="1500" up_thread="false" down_thread="false" /> <pbcast.NAKACK gc_lag="50" retransmit_timeout="600,1200,2400,4800" max_xmit_size="8192" up_thread="false" down_thread="false" /> <UNICAST timeout="600,1200,2400" window_size="100" min_threshold="10" down_thread="false" /> <pbcast.STABLE desired_avg_gossip="20000" up_thread="false" down_thread="false" /> <FRAG frag_size="8192" down_thread="false" up_thread="false" /> <pbcast.GMS join_timeout="15000" join_retry_timeout="15000" shun="true" print_local_addr="true" /> <pbcast.STATE_TRANSFER up_thread="true" down_thread="true" /> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3994019#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...