Here is some additional information. We can ping the JBoss machine from the other machine, running on the different class C network. We can even bring up the JBoss web-console from the machine of the different class C network. So, we know the problem is not in the network hardware, a firewall, etc. The only thing that does not work is a JMS connection between the two. Does anybody know how to work around this problem? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4073062#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...