JGroups add those lines to the log : 2006-10-24 11:31:02,312 [main] DEBUG org.jgroups.conf.ClassConfigurator - mapping is: 1: class org.jgroups.stack.IpAddress 2: class org.jgroups.protocols.CAUSAL$CausalHeader 3: class org.jgroups.protocols.FD$FdHeader 4: class org.jgroups.protocols.FD_PID$FdHeader 5: class org.jgroups.protocols.FD_PROB$FdHeader 6: class org.jgroups.protocols.FD_SOCK$FdHeader 7: class org.jgroups.protocols.FragHeader 8: class org.jgroups.protocols.MERGE$MergeHeader 9: class org.jgroups.protocols.NakAckHeader 10: class org.jgroups.protocols.PARTITIONER$PartitionerHeader 11: class org.jgroups.protocols.PerfHeader 12: class org.jgroups.protocols.PIGGYBACK$PiggybackHeader 13: class org.jgroups.protocols.PingHeader 14: class org.jgroups.protocols.TcpHeader 15: class org.jgroups.protocols.TOTAL$Header 16: class org.jgroups.protocols.TOTAL_OLD$TotalHeader 17: class org.jgroups.protocols.TOTAL_TOKEN$TotalTokenHeader 18: class org.jgroups.protocols.TOTAL_TOKEN$RingTokenHeader 19: class org.jgroups.protocols.TunnelHeader 20: class org.jgroups.protocols.UdpHeader 21: class org.jgroups.protocols.UNICAST$UnicastHeader 22: class org.jgroups.protocols.VERIFY_SUSPECT$VerifyHeader 23: class org.jgroups.protocols.WANPIPE$WanPipeHeader 24: class org.jgroups.protocols.pbcast.GMS$GmsHeader 25: class org.jgroups.protocols.pbcast.NakAckHeader 26: class org.jgroups.protocols.pbcast.PbcastHeader 27: class org.jgroups.protocols.pbcast.STABLE$StableHeader 28: class org.jgroups.protocols.pbcast.STATE_TRANSFER$StateHeader 29: class org.jgroups.protocols.SMACK$SmackHeader 30: class org.jgroups.Message 31: class org.jgroups.View 32: class org.jgroups.ViewId 33: class org.jgroups.util.List 34: interface org.jgroups.Address 35: class org.jgroups.blocks.RequestCorrelator$Header 36: class org.jgroups.protocols.PingRsp 37: class [Ljava.lang.Object; 38: class java.util.Vector 39: class org.jgroups.protocols.pbcast.JoinRsp 40: class org.jgroups.protocols.pbcast.Digest 41: class java.util.Hashtable 53: class org.jgroups.protocols.COMPRESS$CompressHeader 54: class org.jgroups.protocols.FC$FcHeader 55: class org.jgroups.protocols.WanPipeAddress 56: class org.jgroups.protocols.TpHeader 57: class org.jgroups.protocols.ENCRYPT$EncryptHeader 2006-10-24 11:31:02,359 [main] DEBUG org.jgroups.protocols.AUTOCONF - frag_size=64000 2006-10-24 11:31:02,437 [main] DEBUG org.jgroups.protocols.pbcast.GMS - changed role to org.jgroups.protocols.pbcast.ClientGmsImpl When it work, there are periodically many new lines indicating JGroups is searching (testing) the other IPs in the cluster. I'm not seing those lines. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3980309#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...