[HA, MS1S2] When backup slave1 is killed, slave2 can't take role of backup, leaving HA on master only

018-02-01 10:05:39,222 INFO  [io.hawt.web.JolokiaConfiguredAgentServlet] Jolokia overridden property: [key=policyLocation, value=file:/home/jamq/ha-replication//etc/jolokia-access.xml]
2018-02-01 10:05:39,264 INFO  [io.hawt.web.RBACMBeanInvoker] Using MBean [hawtio:type=security,area=jmx,rank=0,name=HawtioDummyJMXSecurity] for role based access control
2018-02-01 10:05:39,499 INFO  [io.hawt.system.ProxyWhitelist] Initial proxy whitelist: [localhost, 127.0.0.1, 172.0.0.14, host-172-0-0-14.openstacklocal]
2018-02-01 10:05:39,863 INFO  [org.apache.activemq.artemis] AMQ241001: HTTP Server started at http://0.0.0.0:8161
2018-02-01 10:05:39,863 INFO  [org.apache.activemq.artemis] AMQ241002: Artemis Jolokia REST API available at http://0.0.0.0:8161/console/jolokia
2018-02-01 10:05:39,863 INFO  [org.apache.activemq.artemis] AMQ241004: Artemis Console available at http://0.0.0.0:8161/console
2018-02-01 10:05:40,883 INFO  [org.apache.activemq.artemis.core.server] AMQ221109: Apache ActiveMQ Artemis Backup Server version 2.4.0.amq-710002-redhat-1 [null] started, waiting live to fail before it gets active



2018-02-01 10:06:43,732 INFO  [io.hawt.web.keycloak.KeycloakServlet] Keycloak integration is disabled
2018-02-01 10:06:52,919 INFO  [io.hawt.web.LoginServlet] hawtio login is using 1800 sec. HttpSession timeout
2018-02-01 10:06:54,872 WARN  [org.apache.activemq.artemis.core.server] AMQ222040: Server is stopped
2018-02-01 10:06:54,874 WARN  [org.apache.activemq.artemis.core.server] AMQ222040: Server is stopped
2018-02-01 10:06:54,874 WARN  [org.apache.activemq.artemis.core.server] AMQ222040: Server is stopped
2018-02-01 10:06:54,874 WARN  [org.apache.activemq.artemis.core.server] AMQ222040: Server is stopped
..
<slave1 & master are already long time down>