We are running jgroups 2.3 and jboss cache 1.2.4.SP2 on Red Hat Linux Enterprise Application Server 4r3. Our jgroups is setup with UDP and tree cache is in replicated synch mode. Sometimes when we access the cache, on both put and get, it does not respond. At the same time that the cache stop responding, all the requests to our own jgroup channels also timeout. The JVM dumps below were taken at the time this occurred. This is a high transactional live environment and we would appreciate any assistance. Dump 1 "http-0.0.0.0-8906-10" daemon prio=1 tid=0x0000002c5e0c7a40 nid=0x7b41 in Object.wait() [0x0000000044622000..0x0000000044623db0] at java.lang.Object.wait(Native Method) - waiting on <0x0000002bdf0898c8> (a java.util.HashMap) at org.jgroups.blocks.GroupRequest.doExecute(GroupRequest.java:492) - locked < 0x0000002bdf0898c8> (a java.util.HashMap) at org.jgroups.blocks.GroupRequest.execute(GroupRequest.java:188) at org.jgroups.blocks.MessageDispatcher.castMessage(MessageDispatcher.java:417) at org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:165) at org.jboss.cache.TreeCache.callRemoteMethods(TreeCache.java:3327) at org.jboss.cache.TreeCache.callRemoteMethods(TreeCache.java:3357) at org.jboss.cache.interceptors.ReplicationInterceptor.handleReplicatedMethod(ReplicationInterceptor.java:122) at org.jboss.cache.interceptors.ReplicationInterceptor.invoke(ReplicationInterceptor.java:87) at org.jboss.cache.TreeCache.invokeMethod(TreeCache.java:4172) at org.jboss.cache.TreeCache.put(TreeCache.java:2914) at org.jboss.cache.TreeCache.put(TreeCache.java:2855) at sun.reflect.GeneratedMethodAccessor162.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80) at org.jboss.mx.server.Invocation.invoke(Invocation.java:72) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644) at mammoth.cache.TreeCacheAOP.put(TreeCacheAOP.java:83) ..Our application code starts here Dump 2 "http-0.0.0.0-8906-10" daemon prio=1 tid=0x0000002c5e0c7a40 nid=0x7b41 waiting for monitor entry [0x0000000044622000..0x0000000044623db0] at mammoth.cache.TreeCacheAOP.put(TreeCacheAOP.java:81) - waiting to lock <0x0000002ae6454350> (a mammoth.cache.TreeCacheAOP) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3970974#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...