Is that a thread dump when it is "quite" on the server? That would be interesting, cut the LAN connection, wait a minute and then do the thread dump. The SLSB passivation might be something interesting to look into. JBossCache might be involved (cluster?). Also there is a thread cpu utilization tool in the JDK. Get the server in a quite state check the values, wait for 5 mins and check the values again to see which threads cause the CPU utilization. In the jmx-console you'll find the ServerInfo-MBean. Invoke the listThreadCpuUtilization() operation. HTH. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4058773#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...