Okay, I've found the wiki entry explaining issues with IPv6 on GNU/Linux. http://wiki.jboss.org/wiki/Wiki.jsp?page=IPv6 I don't know why I'm not seeing this when starting from the command line and only when starting from Eclipse, but adding the following to my VM arguments in Eclipse did seem to help: -Djava.net.preferIPv4Stack=true However, I'm still not able to complete the start of the JBoss 4.2.0 Application Platform. I'm now using JBossTools-200707110856-nightly-ALL-linux-gtk I'm on openSUSE 10.2. 09:02:42,493 INFO [ServerInfo] Java version: 1.5.0_10,Sun Microsystems Inc. | 09:02:42,518 INFO [ServerInfo] Java VM: Java HotSpot(TM) Client VM 1.5.0_10-b03,Sun Microsystems Inc. | 09:02:42,519 INFO [ServerInfo] OS-System: Linux 2.6.18.8-0.5-default,i386 I receive the following Exception: 2007-07-11 09:03:26,944 ERROR [org.jboss.deployment.MainDeployer] Could not start deployment: file:/usr/local/jboss-eap-4.2/jboss-as/server/production/conf/jboss-service.xml | org.jboss.deployment.DeploymentException: start operation failed on package | file:/usr/local/jboss-eap-4.2/jboss-as/server/production/conf/jboss-service.xml; - nested throwable: (java.util.ConcurrentModificationException) | at org.jboss.deployment.SARDeployer.start(SARDeployer.java:311) | at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1025) | at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:819) | at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782) | at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:766) | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) | 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:155) | at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) | at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133) | at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) | at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142) | at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) | at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264) | at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210) | at $Proxy5.deploy(Unknown Source) | at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:482) | at org.jboss.system.server.ServerImpl.start(ServerImpl.java:362) at org.jboss.Main.boot(Main.java:200) | at org.jboss.Main$1.run(Main.java:508) | at java.lang.Thread.run(Thread.java:595) | Caused by: java.util.ConcurrentModificationException | at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449) | at java.util.AbstractList$Itr.next(AbstractList.java:420) | at org.jboss.deployment.SARDeployer.start(SARDeployer.java:299) | ... 23 more View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4063085#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...