Hello,
 
I see this problem too in a 3 node Keycloak cluster, which I created with the Keycloak Helm Chart running on Azure AKS. As test I deleted the keycloak-2 pod, which is then automatically recreated.
The cluster seems to behave normally, but one can see the mentioned warn messages in the log:
keycloak-1 keycloak 17:22:48,312 INFO  [org.infinispan.CLUSTER] (remote-thread--p17-t1) [Context=client-mappings] ISPN100002: Starting rebalance with members [keycloak-1, keycloak-0, keycloak-2], phase READ_OLD_WRITE_ALL, topology id 27
keycloak-1 keycloak 17:22:49,814 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t27) [Context=work] ISPN100009: Advancing to rebalance phase READ_ALL_WRITE_ALL, topology id 28
keycloak-1 keycloak 17:22:50,090 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t27) [Context=work] ISPN100009: Advancing to rebalance phase READ_NEW_WRITE_ALL, topology id 29
keycloak-1 keycloak 17:22:50,101 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t27) [Context=sessions] ISPN100009: Advancing to rebalance phase READ_ALL_WRITE_ALL, topology id 47
keycloak-1 keycloak 17:22:50,103 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t27) [Context=offlineSessions] ISPN100009: Advancing to rebalance phase READ_ALL_WRITE_ALL, topology id 47
keycloak-1 keycloak 17:22:50,104 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t27) [Context=actionTokens] ISPN100009: Advancing to rebalance phase READ_ALL_WRITE_ALL, topology id 48
keycloak-1 keycloak 17:22:50,106 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t27) [Context=clientSessions] ISPN100009: Advancing to rebalance phase READ_ALL_WRITE_ALL, topology id 46
keycloak-0 keycloak 18:46:10,946 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:46:45,085 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:47:19,978 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:47:48,271 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:48:17,167 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:49:00,858 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:49:40,540 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:22:50,391 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t23) [Context=clientSessions] ISPN100009: Advancing to rebalance phase READ_NEW_WRITE_ALL, topology id 47
keycloak-1 keycloak 17:22:50,391 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t22) [Context=actionTokens] ISPN100009: Advancing to rebalance phase READ_NEW_WRITE_ALL, topology id 49
keycloak-1 keycloak 17:22:50,391 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t30) [Context=sessions] ISPN100009: Advancing to rebalance phase READ_NEW_WRITE_ALL, topology id 48
keycloak-1 keycloak 17:22:50,392 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t27) [Context=work] ISPN100010: Finished rebalance with members [keycloak-1, keycloak-0, keycloak-2], topology id 30
keycloak-1 keycloak 17:22:50,392 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t28) [Context=offlineSessions] ISPN100009: Advancing to rebalance phase READ_NEW_WRITE_ALL, topology id 48
keycloak-0 keycloak 18:50:18,760 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:50:55,692 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:51:34,666 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:22:50,394 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t27) [Context=offlineClientSessions] ISPN100009: Advancing to rebalance phase READ_ALL_WRITE_ALL, topology id 49
keycloak-1 keycloak 17:22:50,395 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t27) [Context=authenticationSessions] ISPN100009: Advancing to rebalance phase READ_ALL_WRITE_ALL, topology id 48
keycloak-0 keycloak 18:52:00,242 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:52:18,624 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:52:40,562 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak-1 keycloak 18:52:58,724 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak 17:22:50,399 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t28) [Context=loginFailures] ISPN100009: Advancing to rebalance phase READ_ALL_WRITE_ALL, topology id 48
keycloak-1 keycloak 17:22:50,692 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t27) [Context=sessions] ISPN100010: Finished rebalance with members [keycloak-1, keycloak-0, keycloak-2], topology id 49
keycloak-1 keycloak 17:22:50,693 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t22) [Context=offlineClientSessions] ISPN100009: Advancing to rebalance phase READ_NEW_WRITE_ALL, topology id 50
keycloak-1 keycloak 17:22:50,693 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t25) [Context=authenticationSessions] ISPN100009: Advancing to rebalance phase READ_NEW_WRITE_ALL, topology id 49
keycloak-1 keycloak 17:22:50,693 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t23) [Context=clientSessions] ISPN100010: Finished rebalance with members [keycloak-1, keycloak-0, keycloak-2], topology id 48
keycloak-1 keycloak 17:22:50,692 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t30) [Context=offlineSessions] ISPN100010: Finished rebalance with members [keycloak-1, keycloak-0, keycloak-2], topology id 49
keycloak-1 keycloak 17:22:50,692 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t26) [Context=loginFailures] ISPN100009: Advancing to rebalance phase READ_NEW_WRITE_ALL, topology id 49
keycloak-1 keycloak 17:22:50,697 INFO  [org.infinispan.CLUSTER] (remote-thread--p17-t1) [Context=client-mappings] ISPN100009: Advancing to rebalance phase READ_ALL_WRITE_ALL, topology id 28
keycloak-1 keycloak 17:22:50,696 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t28) [Context=actionTokens] ISPN100010: Finished rebalance with members [keycloak-1, keycloak-0, keycloak-2], topology id 50
keycloak-1 keycloak 17:22:50,993 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t26) [Context=offlineClientSessions] ISPN100010: Finished rebalance with members [keycloak-1, keycloak-0, keycloak-2], topology id 51
keycloak-1 keycloak 17:22:50,993 INFO  [org.infinispan.CLUSTER] (remote-thread--p17-t1) [Context=client-mappings] ISPN100009: Advancing to rebalance phase READ_NEW_WRITE_ALL, topology id 29
keycloak-1 keycloak 17:22:50,993 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t28) [Context=authenticationSessions] ISPN100010: Finished rebalance with members [keycloak-1, keycloak-0, keycloak-2], topology id 50
keycloak-1 keycloak 17:22:50,993 INFO  [org.infinispan.CLUSTER] (remote-thread--p5-t30) [Context=loginFailures] ISPN100010: Finished rebalance with members [keycloak-1, keycloak-0, keycloak-2], topology id 50
keycloak-0 keycloak 18:53:23,710 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:53:40,948 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:54:17,090 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:55:01,945 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:55:28,188 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:56:01,495 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:56:43,653 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:56:59,333 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:57:24,373 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:57:49,312 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:58:09,373 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:58:52,386 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 18:59:35,883 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:00:13,669 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:00:55,143 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:01:17,637 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:01:53,316 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:02:21,274 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:02:45,114 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:03:19,536 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:03:35,989 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:03:51,034 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:22:51,294 INFO  [org.infinispan.CLUSTER] (remote-thread--p17-t1) [Context=client-mappings] ISPN100010: Finished rebalance with members [keycloak-1, keycloak-0, keycloak-2], topology id 30
keycloak-1 keycloak 17:28:58,859 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloakkeycloak-0  17:29:35,708 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:30:00,904 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:30:45,616 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:31:10,447 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:31:48,612 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:32:19,204 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak keycloak 17:32:43,272 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:33:06,470 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:33:23,396 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 19:04:09,147 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:04:50,647 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:05:05,835 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:05:29,407 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:06:12,327 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak-0 keycloak 19:06:54,637 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-0) JGRP000032: keycloak-0: no physical address for keycloak-2, dropping message
keycloak 17:34:01,096 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:34:26,468 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:34:45,733 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:35:11,125 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:35:51,240 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:36:07,178 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:36:28,214 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:37:06,967 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:37:22,194 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:37:57,296 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:38:41,005 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:39:11,305 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:39:30,659 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:40:12,674 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:40:51,718 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:41:06,955 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:41:43,394 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:42:26,488 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:43:00,361 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:43:25,884 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:43:53,646 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:44:08,871 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:44:41,504 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:45:09,314 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:45:53,227 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:46:21,455 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:47:00,441 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:47:32,014 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:48:10,429 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:48:34,421 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:49:08,532 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:49:50,324 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:50:20,557 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:50:51,530 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:51:34,304 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
keycloak-1 keycloak 17:52:09,189 WARN  [org.jgroups.protocols.TCP] (TQ-Bundler-7,ejb,keycloak-1) JGRP000032: keycloak-1: no physical address for keycloak-2, dropping message
The JGroups config looks like this:
        <subsystem xmlns="urn:jboss:domain:jgroups:6.0">
            <channels default="ee">
                <channel name="ee" stack="tcp" cluster="ejb"/>
            </channels>
            <stacks>
                <stack name="udp">
                    <transport type="UDP" socket-binding="jgroups-udp"/>
                    <protocol type="dns.DNS_PING">
                        <property name="dns_query">
                            keycloak-headless.default.svc.cluster.local
                        </property>
                    </protocol>
                    <protocol type="MERGE3"/>
                    <protocol type="FD_SOCK"/>
                    <protocol type="FD_ALL"/>
                    <protocol type="VERIFY_SUSPECT"/>
                    <protocol type="pbcast.NAKACK2"/>
                    <protocol type="UNICAST3"/>
                    <protocol type="pbcast.STABLE"/>
                    <protocol type="pbcast.GMS"/>
                    <protocol type="UFC"/>
                    <protocol type="MFC"/>
                    <protocol type="FRAG3"/>
                </stack>
                <stack name="tcp">
                    <transport type="TCP" socket-binding="jgroups-tcp"/>
                    <protocol type="dns.DNS_PING">
                        <property name="dns_query">
                            keycloak-headless.default.svc.cluster.local
                        </property>
                    </protocol>
                    <protocol type="MERGE3"/>
                    <protocol type="FD_SOCK"/>
                    <protocol type="FD_ALL"/>
                    <protocol type="VERIFY_SUSPECT"/>
                    <protocol type="pbcast.NAKACK2"/>
                    <protocol type="UNICAST3"/>
                    <protocol type="pbcast.STABLE"/>
                    <protocol type="pbcast.GMS"/>
                    <protocol type="MFC"/>
                    <protocol type="FRAG3"/>
                </stack>
            </stacks>
        </subsystem>
        
 
Cheers,
Thomas