Installed JBoss 4.0.4 on two servers with same configuration. Deployed an ejb3 application on both of them. On the client side, the following code is used to do the lookup: Hashtable env = new Hashtable(); env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory"); env.put(Context.PROVIDER_URL, p.getProperty("URL", "server:1099")); Context c = new InitialContext(env); System.out.println("Lookup : " + System.currentTimeMillis()); myservice = (myservice) c.lookup(" myservicebean/remote"); System.out.println(System.currentTimeMillis()); The problem is that on one network, it takes about 500ms, and on the other network, it takes 15s. These two network are similar network (windows servers with a bunch of windows client. The slow one doesn't have internet connection though.). If I run the application on server machine only (JBOSS & Client application on same machine instead of two machines. i.e. install client on the server and change the above url to something like "localhost:1099)). The speed is fine. The network itself seems not a problem. I used ping to test network speed on both network. It seems the slow one even has a faster roundtrip time. So can anyone give me some hints on how to debug this kind of problem? Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3995972#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...