[Server:ha-server-3] 13:59:13,122 WARNING [org.jgroups.protocols.UDP] (OOB-15,null) null: no physical address for 766de5c9-8ac2-6d30-89ef-78d39aa5f7eb, dropping message
In My case, it was due to having multiple jboss clusters at a same network and each of the clusters were having same name. For example ha-server-1 and ha-server-2 existed at two different clusters in different machines.
I have resolved this problem by changing the ha-server names. Note: Both were independent cluster. I assume it happened due to the multicast issue of JGroups. Any further explanation from an expert like you will be nice.