Hi, I am trying the clustering in jboss 5.1.0 installed in two different machines with Apache 2.2.8 and mod_jk-1.2.28-httpd-2.2.3. The loadbalacing is working. But when i shut down one server, then the session of that particular server is not being maintained and am getting 503 exception with the below exception in mod_jk.log Exception: [Wed Sep 02 14:51:35 2009][3060:3416] [debug] jk_lb_worker.c (950): searching worker for session route node1 [Wed Sep 02 14:51:35 2009][3060:3416] [info] jk_lb_worker.c (981): all workers are in error state for session YcpysrgSEAz5HMz+mXxp3A__.node1 [Wed Sep 02 14:51:35 2009][3060:3416] [info] jk_lb_worker.c (1453): All tomcat instances failed, no more workers left (attempt=1, retry=1) [Wed Sep 02 14:51:35 2009][3060:3416] [info] jk_lb_worker.c (1464): All tomcat instances are busy or in error state [Wed Sep 02 14:51:35 2009][3060:3416] [error] jk_lb_worker.c (1469): All tomcat instances failed, no more workers left [Wed Sep 02 14:51:35 2009]router 10.68.200.122 2.390595 [Wed Sep 02 14:51:35 2009][3060:3416] [info] mod_jk.c (2615): Service error=0 for worker=router Below are my configuration: httpd.conf JkWorkersFile conf/workers.properties JkLogFile logs/mod_jk.log JkLogLevel debug JkLogStampFormat "[%a %b %d %H:%M:%S %Y]" JkMount /*.jsp router JkMount /*.* router JkMount /war31/* router JkMount /mbankserver2/* router JkMount /jmx-console/* router JkRequestLogFormat "%w %V %T" JkShmFile logs/jk.shm <Location /jkstatus/> JkMount jkstatus Order deny,allow Deny from all Allow from 127.0.0.1 workers.properties worker.node1.port=8009 worker.node1.host=ip worker.node1.type=ajp13 worker.node1.lbfactor=1 worker.node1.cachesize=10 worker.node2.port=8009 worker.node2.host=ip worker.node2.type=ajp13 worker.node2.lbfactor=1 worker.node2.cachesize=10 worker.list=router,jkstatus worker.router.type=lb worker.router.balance_workers=node1,node2 worker.router.sticky_session=1 worker.jkstatus.type=status In application web.xml - Added the distributable tag jboss-web.xml <jboss-web> <replication-config> <replication-trigger>SET_AND_NON_PRIMITIVE_GET</replication-trigger> <replication-granularity>SESSION</replication-granularity> <replication-field-batch-mode>true</replication-field-batch-mode> </replication-config> </jboss-web> In both machine Jboss 1. Configured the jvmRoute in server.xml 2. Mentioned the path as SESSIONS.sar in context.xml Starting the jboss with run -c all -b ip Please let me know if i am missing something in the configuration. Thanks. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4253032#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...