Unable to form a single cluster island.  Two clusters formed and kills one

I am trying to use ReplicatedCache and deployed the web application on four Webspher appserver JVMs in two linux servers (2 boxes). Server1 (A&B) Server2 (A&B). Server1A and Server2A physical clusters and likewise Server1B and Server2B are physical clusters.
Server1 A & B forms a coherence cluster island and Server2 A & B forms another cluster island. After few seconds the Server2 cluster node on B identifies the existence of another cluster island and activates the panic protocol. So the Server1 A or B receives the panic message and sends kill message to the other cluster member on Server1. Ultimately, the cluster service on Server1 is stopped and both the members leave the cluster. How do I fix this?
I want to have one cluster and all the four nodes to be members of this cluster so that the cache is replicated in all the four nodes. Please help.
Note: The coherence.jar and tangosol.jar are inside the WEB-INF/lilb in the war and the same war file deployed in four jvms.
Included below the logs from four jvms:
Log - Server2-B:
[9/9/08 18:58:15:754 GMT] 0000003a SystemErr R 2008-09-09 18:58:15.731 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=server.startup : 0, member=n/a): Loaded operational overrides from resource "wsjar:file:/opt/IBM/WebSphere61/AppServer/profiles/ADNA-S-Node/installedApps/ADNA-S/ADNALinker-B.ear/ADNALinker.war/WEB-INF/lib/coherence.jar!/tangosol-coherence-override-prod.xml"
[9/9/08 18:58:15:755 GMT] 0000003a SystemErr R 2008-09-09 18:58:15.733 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=server.startup : 0, member=n/a): Optional configuration override "/tangosol-coherence-override.xml" is not specified
[9/9/08 18:58:15:909 GMT] 0000003a SystemErr R 2008-09-09 18:58:15.899 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=server.startup : 0, member=n/a): Loaded cache configuration from resource "file:/opt/IBM/WebSphere61/AppServer/profiles/ADNA-S-Node/installedApps/ADNA-S/ADNALinker-B.ear/ADNALinker.war/WEB-INF/classes/adnalinker-coherence-config.xml"
[9/9/08 18:58:17:516 GMT] 0000003a SystemErr R 2008-09-09 18:58:17.516 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=n/a): Service Cluster joined the cluster with senior service member n/a
[9/9/08 18:58:49:242 GMT] 0000003a SystemErr R 2008-09-09 18:58:49.241 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=Cluster, member=n/a): Created a new cluster with Member(Id=1, Timestamp=2008-09-09 18:58:17.319, Address=10.29.29.33:8088, MachineId=2593, Edition=DataGrid Edition, Mode=Production, CpuCount=4, SocketCount=2) UID=0x0A1D1D210000011C487A76670A211F98
[9/9/08 18:58:49:501 GMT] 0000003a SystemErr R 2008-09-09 18:58:49.500 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=ReplicatedCache, member=1): Service ReplicatedCache joined the cluster with senior service member 1
[9/9/08 18:58:49:589 GMT] 0000003a SystemErr R 2008-09-09 18:58:49.588 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=1): Member(Id=2, Timestamp=2008-09-09 18:58:49.379, Address=10.29.29.33:8089, MachineId=2593) joined Cluster with senior member 1
[9/9/08 18:58:49:966 GMT] 0000003a SystemErr R 2008-09-09 18:58:49.965 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=1): Member 2 joined Service ReplicatedCache with senior member 1
[9/9/08 18:58:50:130 GMT] 00000032 SystemErr R log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
[9/9/08 18:58:50:130 GMT] 00000032 SystemErr R log4j:WARN Please initialize the log4j system properly.
[9/9/08 18:58:51:285 GMT] 0000003a SystemErr R 2008-09-09 18:58:51.262 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=1): TcpRing: connecting to member 2 using TcpSocket{State=STATE_OPEN, Socket=Socket[addr=houmaasas02.cce.star/10.29.29.33,port=8089,localport=44068]}
[9/9/08 18:58:51:750 GMT] 00000034 SystemErr R log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
[9/9/08 18:58:51:751 GMT] 00000034 SystemErr R log4j:WARN Please initialize the log4j system properly.
[9/9/08 20:23:28:160 GMT] 0000003a SystemErr R 2008-09-09 20:23:28.160 Tangosol Coherence DGE 3.2.2/371 <Warning> (thread=Cluster, member=1): **An existence of a cluster island with senior Member(Id=1, Timestamp=2008-09-09 18:58:17.537, Address=10.29.29.31:8088, MachineId=2591) containing 2 nodes have been detected. Since this Member(Id=1, Timestamp=2008-09-09 18:58:17.319, Address=10.29.29.33:8088, MachineId=2593) is the senior of an older cluster island, the panic protocol is being activated to stop the other island's senior and all junior nodes that belong to it.**
**[9/9/08 20:23:28:161 GMT] 0000003a SystemErr R 2008-09-09 20:23:28.161 Tangosol Coherence DGE 3.2.2/371 <Warning> (thread=Cluster, member=1): Received panic from junior member Member(Id=2, Timestamp=2008-09-09 18:58:49.379, Address=10.29.29.33:8089, MachineId=2593) caused by Member(Id=1, Timestamp=2008-09-09 18:58:17.537, Address=10.29.29.31:8088, MachineId=2591)*******************************************************
Log Server2-A:
[9/9/08 18:58:16:875 GMT] 0000003d SystemErr R 2008-09-09 18:58:16.787 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=server.startup : 1, member=n/a): Loaded operational overrides from resource "wsjar:file:/opt/IBM/WebSphere61/AppServer/profiles/ADNA-S-Node/installedApps/ADNA-S/ADNALinker-A.ear/ADNALinker.war/WEB-INF/lib/coherence.jar!/tangosol-coherence-override-prod.xml"
[9/9/08 18:58:16:876 GMT] 0000003d SystemErr R 2008-09-09 18:58:16.790 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=server.startup : 1, member=n/a): Optional configuration override "/tangosol-coherence-override.xml" is not specified
[9/9/08 18:58:17:124 GMT] 0000003d SystemErr R 2008-09-09 18:58:17.045 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=server.startup : 1, member=n/a): Loaded cache configuration from resource "file:/opt/IBM/WebSphere61/AppServer/profiles/ADNA-S-Node/installedApps/ADNA-S/ADNALinker-A.ear/ADNALinker.war/WEB-INF/classes/adnalinker-coherence-config.xml"
[9/9/08 18:58:18:479 GMT] 0000003d SystemErr R 2008-09-09 18:58:18.479 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=n/a): Service Cluster joined the cluster with senior service member n/a
[9/9/08 18:58:49:607 GMT] 0000003d SystemErr R 2008-09-09 18:58:49.601 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=Cluster, member=n/a): This Member(Id=2, Timestamp=2008-09-09 18:58:49.379, Address=10.29.29.33:8089, MachineId=2593, Edition=DataGrid Edition, Mode=Production, CpuCount=4, SocketCount=2) joined cluster with senior Member(Id=1, Timestamp=2008-09-09 18:58:17.319, Address=10.29.29.33:8088, MachineId=2593, Edition=DataGrid Edition, Mode=Production, CpuCount=4, SocketCount=2)
[9/9/08 18:58:49:658 GMT] 0000003d SystemErr R 2008-09-09 18:58:49.658 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=n/a): Member 1 joined Service ReplicatedCache with senior member 1
[9/9/08 18:58:49:993 GMT] 0000003d SystemErr R 2008-09-09 18:58:49.992 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=ReplicatedCache, member=2): Service ReplicatedCache joined the cluster with senior service member 1
[9/9/08 18:58:50:515 GMT] 00000035 SystemErr R log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
[9/9/08 18:58:50:516 GMT] 00000035 SystemErr R log4j:WARN Please initialize the log4j system properly.
[9/9/08 18:58:51:310 GMT] 0000003d SystemErr R 2008-09-09 18:58:51.287 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=TcpRingListener, member=2): TcpRing: connecting to member 1 using TcpSocket{State=STATE_OPEN, Socket=Socket[addr=/10.29.29.33,port=44068,localport=8089]}
[9/9/08 18:58:52:383 GMT] 00000036 SystemErr R log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
[9/9/08 18:58:52:383 GMT] 00000036 SystemErr R log4j:WARN Please initialize the log4j system properly.
[9/9/08 20:23:28:162 GMT] 0000003d SystemErr R 2008-09-09 20:23:28.162 Tangosol Coherence DGE 3.2.2/371 <Error> (thread=Cluster, member=2): Received panic from senior member Member(Id=1, Timestamp=2008-09-09 18:58:17.319, Address=10.29.29.33:8088, MachineId=2593) caused by Member(Id=1, Timestamp=2008-09-09 18:58:17.537, Address=10.29.29.31:8088, MachineId=2591)
Log from Server1-A:
[9/9/08 18:58:15:656 GMT] 0000002a SystemErr R 2008-09-09 18:58:15.645 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=server.startup : 2, member=n/a): Loaded operational overrides from resource "wsjar:file:/opt/IBM/WebSphere61/AppServer/profiles/ADNA-S-Node/installedApps/ADNA-S/ADNALinker-A.ear/ADNALinker.war/WEB-INF/lib/coherence.jar!/tangosol-coherence-override-prod.xml"
[9/9/08 18:58:15:656 GMT] 0000002a SystemErr R 2008-09-09 18:58:15.647 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=server.startup : 2, member=n/a): Optional configuration override "/tangosol-coherence-override.xml" is not specified
[9/9/08 18:58:15:800 GMT] 0000002a SystemErr R 2008-09-09 18:58:15.790 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=server.startup : 2, member=n/a): Loaded cache configuration from resource "file:/opt/IBM/WebSphere61/AppServer/profiles/ADNA-S-Node/installedApps/ADNA-S/ADNALinker-A.ear/ADNALinker.war/WEB-INF/classes/adnalinker-coherence-config.xml"
[9/9/08 18:58:17:827 GMT] 0000002a SystemErr R 2008-09-09 18:58:17.796 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=n/a): Service Cluster joined the cluster with senior service member n/a
[9/9/08 18:58:49:711 GMT] 0000002a SystemErr R 2008-09-09 18:58:49.711 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=Cluster, member=n/a): Created a new cluster with Member(Id=1, Timestamp=2008-09-09 18:58:17.537, Address=10.29.29.31:8088, MachineId=2591, Edition=DataGrid Edition, Mode=Production, CpuCount=4, SocketCount=2) UID=0x0A1D1D1F0000011C487A77410A1F1F98
[9/9/08 18:58:49:949 GMT] 0000002a SystemErr R 2008-09-09 18:58:49.946 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=1): Member(Id=2, Timestamp=2008-09-09 18:58:49.739, Address=10.29.29.31:8089, MachineId=2591) joined Cluster with senior member 1
[9/9/08 18:58:50:124 GMT] 0000002a SystemErr R 2008-09-09 18:58:50.122 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=ReplicatedCache, member=1): Service ReplicatedCache joined the cluster with senior service member 1
[9/9/08 18:58:50:355 GMT] 0000002a SystemErr R 2008-09-09 18:58:50.354 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=1): Member 2 joined Service ReplicatedCache with senior member 1
[9/9/08 18:58:50:654 GMT] 00000025 SystemErr R log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
[9/9/08 18:58:50:654 GMT] 00000025 SystemErr R log4j:WARN Please initialize the log4j system properly.
[9/9/08 18:58:51:745 GMT] 0000002a SystemErr R 2008-09-09 18:58:51.744 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=1): TcpRing: connecting to member 2 using TcpSocket{State=STATE_OPEN, Socket=Socket[addr=houmaasas01.cce.star/10.29.29.31,port=8089,localport=48201]}
[9/9/08 18:58:52:852 GMT] 00000024 SystemErr R log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
[9/9/08 18:58:52:852 GMT] 00000024 SystemErr R log4j:WARN Please initialize the log4j system properly.
[9/9/08 19:08:22:944 GMT] 0000002a SystemErr R 2008-09-09 19:08:22.944 Tangosol Coherence DGE 3.2.2/371 <Warning> (thread=Cluster, member=1): Received panic from junior member Member(Id=2, Timestamp=2008-09-09 18:58:49.739, Address=10.29.29.31:8089, MachineId=2591) caused by Member(Id=1, Timestamp=2008-09-09 18:58:17.319, Address=10.29.29.33:8088, MachineId=2593)
[9/9/08 20:23:28:161 GMT] 0000002a SystemErr R 2008-09-09 20:23:28.160 Tangosol Coherence DGE 3.2.2/371 <Error> (thread=Cluster, member=1): Received a Kill message from a valid Member(Id=2, Timestamp=2008-09-09 18:58:49.379, Address=10.29.29.33:8089, MachineId=2593); stopping cluster service.
[9/9/08 20:23:30:168 GMT] 0000002a SystemErr R 2008-09-09 20:23:30.166 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=1): Service Cluster left the cluster
[9/9/08 20:23:30:171 GMT] 0000002a SystemErr R 2008-09-09 20:23:30.170 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=ReplicatedCache, member=1): Service ReplicatedCache left the cluster
Log from Server1-B:
[9/9/08 18:58:18:602 GMT] 00000043 SystemErr R 2008-09-09 18:58:18.591 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=server.startup : 0, member=n/a): Loaded operational overrides from resource "wsjar:file:/opt/IBM/WebSphere61/AppServer/profiles/ADNA-S-Node/installedApps/ADNA-S/ADNALinker-B.ear/ADNALinker.war/WEB-INF/lib/coherence.jar!/tangosol-coherence-override-prod.xml"
[9/9/08 18:58:18:602 GMT] 00000043 SystemErr R 2008-09-09 18:58:18.593 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=server.startup : 0, member=n/a): Optional configuration override "/tangosol-coherence-override.xml" is not specified
[9/9/08 18:58:18:784 GMT] 00000043 SystemErr R 2008-09-09 18:58:18.784 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=server.startup : 0, member=n/a): Loaded cache configuration from resource "file:/opt/IBM/WebSphere61/AppServer/profiles/ADNA-S-Node/installedApps/ADNA-S/ADNALinker-B.ear/ADNALinker.war/WEB-INF/classes/adnalinker-coherence-config.xml"
[9/9/08 18:58:20:282 GMT] 00000043 SystemErr R 2008-09-09 18:58:20.282 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=n/a): Service Cluster joined the cluster with senior service member n/a
[9/9/08 18:58:50:006 GMT] 00000043 SystemErr R 2008-09-09 18:58:50.006 Tangosol Coherence DGE 3.2.2/371 <Info> (thread=Cluster, member=n/a): This Member(Id=2, Timestamp=2008-09-09 18:58:49.739, Address=10.29.29.31:8089, MachineId=2591, Edition=DataGrid Edition, Mode=Production, CpuCount=4, SocketCount=2) joined cluster with senior Member(Id=1, Timestamp=2008-09-09 18:58:17.537, Address=10.29.29.31:8088, MachineId=2591, Edition=DataGrid Edition, Mode=Production, CpuCount=4, SocketCount=2)
[9/9/08 18:58:50:114 GMT] 00000043 SystemErr R 2008-09-09 18:58:50.114 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=2): Member 1 joined Service ReplicatedCache with senior member 1
[9/9/08 18:58:50:365 GMT] 00000043 SystemErr R 2008-09-09 18:58:50.361 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=ReplicatedCache, member=2): Service ReplicatedCache joined the cluster with senior service member 1
[9/9/08 18:58:50:894 GMT] 00000038 SystemErr R log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
[9/9/08 18:58:50:895 GMT] 00000038 SystemErr R log4j:WARN Please initialize the log4j system properly.
[9/9/08 18:58:51:808 GMT] 00000043 SystemErr R 2008-09-09 18:58:51.806 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=TcpRingListener, member=2): TcpRing: connecting to member 1 using TcpSocket{State=STATE_OPEN, Socket=Socket[addr=/10.29.29.31,port=48201,localport=8089]}
[9/9/08 20:23:28:239 GMT] 00000043 SystemErr R 2008-09-09 20:23:28.237 Tangosol Coherence DGE 3.2.2/371 <Error> (thread=Cluster, member=2): Received a Kill message from a valid Member(Id=1, Timestamp=2008-09-09 18:58:17.537, Address=10.29.29.31:8088, MachineId=2591); stopping cluster service.
[9/9/08 20:23:28:240 GMT] 00000043 SystemErr R 2008-09-09 20:23:28.238 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=Cluster, member=2): Service Cluster left the cluster
[9/9/08 20:23:28:242 GMT] 00000043 SystemErr R 2008-09-09 20:23:28.241 Tangosol Coherence DGE 3.2.2/371 <D5> (thread=ReplicatedCache, member=2): Service ReplicatedCache left the cluster
Edited by: user533771 on Sep 10, 2008 9:56 AM

Hi,
Please take a look at this wiki page on how to verify and troubleshoot multicast support: http://wiki.tangosol.com/display/COH33UG/Multicast+Test . Most likely (but I can be wrong), all you need to do is to add java.net.preferIPv4Stack=true system property to the jvm command line.
Regards,
Dimitri

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