You mentioned reading the wiki page -- I assume you meant http://wiki.jboss.org/wiki/Wiki.jsp?page=Shunning. Setting shun="false" will prevent JGroups shunning the node, but that doesn't mean the performance of that node is acceptable to the JBoss Cache running on top of JGroups. When JBC replicates data to the other nodes in the cluster, it has a configurable timeout (SyncReplTimeout) that controls how long it will wait for those nodes to respond that they received and applied the replication. The ReplicationException you reported is an indication that this is happening and really is a different thing from shunning. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982836#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...