I am running two AP on a multi-IP WinxP machine. I tried to specified the IP address for each AP listening multicast. According "JBoss 4 Application Server clustering Guide" page 38. their is an attribute "bind_to_all_interfaces" to disable or enable whether this node should listen on all interfaces for mulicasts. The default value is false. However, I found that it bind all interfaces when I ran those APs and caused the following error for one of my AP 2006-11-22 17:15:23,812 DEBUG [org.jboss.cache.aop.TreeCacheAop] Starting jboss.cache:service=TomcatClusteringCache 2006-11-22 17:15:23,921 ERROR [org.jgroups.JChannel] exception: java.lang.Exception: exception caused by UDP.start(): java.net.BindException: Address already in use: Cannot bind 2006-11-22 17:15:23,937 DEBUG [org.jboss.cache.aop.TreeCacheAop] Starting failed jboss.cache:service=TomcatClusteringCache ChannelException: java.lang.Exception: exception caused by UDP.start(): java.net.BindException: Address already in use: Cannot bind at org.jgroups.JChannel.connect(JChannel.java:328) at org.jboss.cache.TreeCache.startService(TreeCache.java:1424) at org.jboss.cache.aop.PojoCache.startService(PojoCache.java:94) at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBean Does anyone have an idea about it? I have tried to add bind_to_all_interfaces=false in jboss-service.xml under tc5-cluster.sar. However, this attribute seems not a recognized .. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3987846#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...