"bstansberry(a)jboss.com" wrote : | You can't run multiple channels with the same singleton name and the same channel name in the same VM. That's a hassle in testsuites, which is where people typically try to do that. This is not a regression; JBM didn't have a singleton name in its config before. You and I discussed the two workarounds to this, which are basically testsuite config changes. You say the workarounds didn't work. We need to understand why not, so we can determine if that means there is an actual JGroups regression. I had tried your suggestions and I couldn't get each JChannel to talk to each other. After Vlad's post I understood that this wouldn't work any way. But today I was playing with JChannel alone in a test, and I figured out I needed to make sure I had java.net.preferIPv4Stack=true on my VM. After setting that it worked. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4189935#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...