Hello, all ... I also see the following message in the log of the node that won't communicate: 2008-03-28 16:44:30,180 ERROR [org.jgroups.protocols.pbcast.GMS] merge_id ([216.239.XXX.XXX:9900|1206745285182]) or this.merge_id (null) is null (sender=10.15.XXX.XXX:9900). ... I XXXed out the last 2 octets of the IP addresses. Does this additional message help at all? Regards, John Falling You - exploring the beauty of voice and sound http://www.fallingyou.com