[ https://issues.jboss.org/browse/JGRP-2293?page=com.atlassian.jira.plugin.... ] Dan Berindei commented on JGRP-2293: ------------------------------------ [~belaban] yeah, the {{.0}} was a typo and I removed it. The command line is exactly the one I used. Not sure about the non-loopback requirement, the test hard-codes the TCP bind address to {{127.0.0.1}}, but doesn't set any property on MPING, meaning it will use [default mcast address 230.5.6.7|https://github.com/belaban/JGroups/blob/de91ff4e222011d287016a7...] and bind to [system property {{jgroups.bind_addr}}=localhost|https://github.com/belaban/JGroups/blob/e103fabd73ff783a456036f3071ab9011ce87da4/build.properties.template#L6] I've enabled trace logs and both the passing IDE run and the failing Maven run report the same addresses: {noformat} mvn: 14:41:47,971 DEBUG (main:[]) [MPING] bind_addr=/127.0.0.1, mcast_addr=/230.5.6.7, mcast_port=7555 ide: 14:39:50,826 DEBUG (main:[]) [MPING] bind_addr=/127.0.0.1, mcast_addr=/230.5.6.7, mcast_port=7555 {noformat} Unfortunately there isn't anything else interesting in the logs. I did get one of the test methods to fail in the IDE, but I think the problem is in the test. You may want to get rid of the streams, it looks pretty tough to debug as is: {noformat} FAIL: [1] org.jgroups.tests.LeaveTest.testCoordLeave() java.lang.AssertionError at org.jgroups.tests.LeaveTest.testCoordLeave(LeaveTest.java:71) {noformat} -- This message was sent by Atlassian Jira (v7.12.1#712002)