I was able to recreate this in my own bare jgroups tests. I made a test where 4 members join and do a separate getState. The test does this repeatedly 10 times. Having loopback true fails at least on of these 10 runs. Having loopback false gives much better performance. I have isolated the problem and I am testing a fix that would handle this problem regardless of loopback being turned of or on! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4188144#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...