When trying to enable clustered caching we ran into this problem:
Setup:
We have 2 servers on one of the servers (server2) we receve no errors

configuration on server 1 ip: 192.168.100.51

  | #cache.memory=true
  | #cache.capacity=100
  | #gdp.cache.debug=false
  | gdp.cache.lifetime=1800
  | #cache.cluster.multicast.ip=231.12.21.100
  | 
cache.cluster.properties=UDP(mcast_addr=231.12.21.100;mcast_port=30210;bind_addr=192.168.100.51:1509;ip_ttl=32;\
  | mcast_send_buf_size=150000;mcast_recv_buf_size=80000):\
  | PING(timeout=2000;num_initial_members=10):\
  | MERGE2(min_interval=5000;max_interval=10000):\
  | FD_SOCK:VERIFY_SUSPECT(timeout=2000):\
  | 
pbcast.NAKACK(gc_lag=50;retransmit_timeout=300,600,1200,2400,4800;max_xmit_size=8192):\
  | UNICAST(timeout=300,600,1200,2400):\
  | pbcast.STABLE(desired_avg_gossip=20000):\
  | FRAG(frag_size=8096;down_thread=false;up_thread=false):\
  | 
pbcast.GMS(join_timeout=10000;join_retry_timeout=4000;shun=true;print_local_addr=true)
  | 

configuration on server2 ip: 192.168.100.45

  | #cache.memory=true
  | #cache.capacity=100
  | #gdp.cache.debug=false
  | gdp.cache.lifetime=1800
  | #cache.cluster.multicast.ip=231.12.21.100
  | 
cache.cluster.properties=UDP(mcast_addr=231.12.21.100;mcast_port=30210;bind_addr=192.168.100.45;ip_ttl=32;\
  | mcast_send_buf_size=150000;mcast_recv_buf_size=80000):\
  | PING(timeout=2000;num_initial_members=10):\
  | MERGE2(min_interval=5000;max_interval=10000):\
  | FD_SOCK:VERIFY_SUSPECT(timeout=2000):\
  | 
pbcast.NAKACK(gc_lag=50;retransmit_timeout=300,600,1200,2400,4800;max_xmit_size=8192):\
  | UNICAST(timeout=300,600,1200,2400):\
  | pbcast.STABLE(desired_avg_gossip=20000):\
  | FRAG(frag_size=8096;down_thread=false;up_thread=false):\
  | 
pbcast.GMS(join_timeout=10000;join_retry_timeout=4000;shun=true;print_local_addr=true)
  | 

oscache.properties (on both servers)

  | cache.memory=true
  | cache.capacity=2000
  | cache.algorithm=com.opensymphony.oscache.base.algorithm.LRUCache
  | gdp.cache.debug=false
  | gdp.cache.lifetime=3600
  | #for development purposes
  | #gdp.cache.lifetime=60
  | 
cache.event.listeners=com.opensymphony.oscache.plugins.clustersupport.JavaGroupsBroadcastingListener
  | 

Error:

  | 2006-02-15 18:01:31,109 [AloneScheduler_Worker-0] ERROR  
com.opensymphony.oscache.base.AbstractCacheAdministrator 
(AbstractCacheAdministrator.java:332) - Could not initialize listener 
'com.opensymphony.oscache.plugins.clustersupport.JavaGroupsBroadcastingListener'.
 Listener ignored. - configureStandardListeners
  | com.opensymphony.oscache.base.InitializationException: Initialization 
failed: ChannelException: unable to setup the protocol stack
  |     at 
com.opensymphony.oscache.plugins.clustersupport.JavaGroupsBroadcastingListener.initialize(JavaGroupsBroadcastingListener.java:119)
  |     at 
com.opensymphony.oscache.base.AbstractCacheAdministrator.configureStandardListeners(AbstractCacheAdministrator.java:330)
  |     at 
com.opensymphony.oscache.general.GeneralCacheAdministrator.createCache(GeneralCacheAdministrator.java:297)
  |     at 
com.opensymphony.oscache.general.GeneralCacheAdministrator.<init>(GeneralCacheAdministrator.java:99)
  |     at com.gdp3000.permission.PermissionDataManager.getCacheAdmin(Unknown 
Source)
  |     at 
com.gdp3000.permission.PermissionDataManager.getUserWithFilter(Unknown Source)
  |     at com.gdp3000.permission.PermissionDataManager.getUserByUid(Unknown 
Source)
  |     at com.gdp3000.permission.PermissionManager.checkUserIdPassword(Unknown 
Source)
  |     at com.gdp3000.permission.PermissionManager.authenticate(Unknown Source)
  |     at com.gudrun.scheduler.GdpStatefulJob.execute(Unknown Source)
  |     at com.gdp3000.communication.email.EMailListener.execute(Unknown Source)
  |     at org.quartz.core.JobRunShell.run(JobRunShell.java:188)
  |     at 
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:511)
  | 2006-02-15 18:01:31,156 [AloneScheduler_Worker-2] ERROR  
com.opensymphony.oscache.base.AbstractCacheAdministrator 
(AbstractCacheAdministrator.java:332) - Could not initialize listener 
'com.opensymphony.oscache.plugins.clustersupport.JavaGroupsBroadcastingListener'.
 Listener ignored. - configureStandardListeners
  | com.opensymphony.oscache.base.InitializationException: Initialization 
failed: ChannelException: unable to setup the protocol stack
  |     at 
com.opensymphony.oscache.plugins.clustersupport.JavaGroupsBroadcastingListener.initialize(JavaGroupsBroadcastingListener.java:119)
  |     at 
com.opensymphony.oscache.base.AbstractCacheAdministrator.configureStandardListeners(AbstractCacheAdministrator.java:330)
  |     at 
com.opensymphony.oscache.general.GeneralCacheAdministrator.createCache(GeneralCacheAdministrator.java:297)
  |     at 
com.opensymphony.oscache.general.GeneralCacheAdministrator.<init>(GeneralCacheAdministrator.java:99)
  |     at com.gdp3000.permission.PermissionDataManager.getCacheAdmin(Unknown 
Source)
  |     at 
com.gdp3000.permission.PermissionDataManager.getUserWithFilter(Unknown Source)
  |     at com.gdp3000.permission.PermissionDataManager.getUserByUid(Unknown 
Source)
  |     at com.gdp3000.permission.PermissionManager.checkUserIdPassword(Unknown 
Source)
  |     at com.gdp3000.permission.PermissionManager.authenticate(Unknown Source)
  |     at com.gudrun.scheduler.GdpStatefulJob.execute(Unknown Source)
  |     at com.gdp3000.communication.email.EMailListener.execute(Unknown Source)
  |     at org.quartz.core.JobRunShell.run(JobRunShell.java:188)
  |     at 
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:511)
  | 

What are we missing here ?

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