I have configured an Artemis cluster through JGroup protocol using shared store HA policy. When I disable the firewalld service everything works fine including failover and failback. But when I enable the firewalld service messages are failing to send from one node to other. I have opened the required port 61616 and 8161 through command
sudo firewall-cmd --zone=public --permanent --add-port=61616/tcp
sudo firewall-cmd --zone=public --permanent --add-port=8161/tcp
firewall-cmd --reload
master-broker.xml file
<connectors>
<connector name="netty-connector">tcp://172.16.20.129:61616</connector>
</connectors>
<!-- Acceptors -->
<acceptors>
<acceptor name="netty-acceptor">tcp://172.16.20.129:61616</acceptor>
</acceptors>
<!-- Clustering configuration -->
<broadcast-groups>
<broadcast-group name="Artemis-broadcast-group">
<broadcast-period>5000</broadcast-period>
<jgroups-file>test-jgroups-file_ping.xml</jgroups-file>
<jgroups-channel>active_broadcast_channel</jgroups-channel>
<connector-ref>netty-connector</connector-ref>
</broadcast-group>
</broadcast-groups>
<discovery-groups>
<discovery-group name="Artemis-discovery-group">
<jgroups-file>test-jgroups-file_ping.xml</jgroups-file>
<jgroups-channel>active_broadcast_channel</jgroups-channel>
<refresh-timeout>10000</refresh-timeout>
</discovery-group>
</discovery-groups>
<!-- This is a symmetric cluster -->
<cluster-connections>
<cluster-connection name="Demo-Artemis-Cluster">
<address></address>
<connector-ref>netty-connector</connector-ref>
<check-period>1000</check-period>
<connection-ttl>5000</connection-ttl>
<min-large-message-size>50000</min-large-message-size>
<call-timeout>5000</call-timeout>
<retry-interval>500</retry-interval>
<retry-interval-multiplier>1.0</retry-interval-multiplier>
<max-retry-interval>5000</max-retry-interval>
<initial-connect-attempts>-1</initial-connect-attempts>
<reconnect-attempts>-1</reconnect-attempts>
<use-duplicate-detection>true</use-duplicate-detection>
<message-load-balancing>ON_DEMAND</message-load-balancing>
<max-hops>1</max-hops>
<confirmation-window-size>32000</confirmation-window-size>
<call-failover-timeout>30000</call-failover-timeout>
<notification-interval>1000</notification-interval>
<notification-attempts>2</notification-attempts>
<discovery-group-ref discovery-group-name="Artemis-discovery-group"/>
</cluster-connection>
</cluster-connections>
test-jgroup-file_ping.xml
<config xmlns="urn:org:jgroups"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/JGroups-3.0.xsd">
<TCP loopback="true"
recv_buf_size="20000000"
send_buf_size="640000"
discard_incompatible_packets="true"
max_bundle_size="64000"
max_bundle_timeout="30"
enable_bundling="true"
use_send_queues="false"
sock_conn_timeout="300"
thread_pool.enabled="true"
thread_pool.min_threads="1"
thread_pool.max_threads="10"
thread_pool.keep_alive_time="5000"
thread_pool.queue_enabled="false"
thread_pool.queue_max_size="100"
thread_pool.rejection_policy="run"
oob_thread_pool.enabled="true"
oob_thread_pool.min_threads="1"
oob_thread_pool.max_threads="8"
oob_thread_pool.keep_alive_time="5000"
oob_thread_pool.queue_enabled="false"
oob_thread_pool.queue_max_size="100"
oob_thread_pool.rejection_policy="run"/>
<FILE_PING location="/mnt/devops-nfs-share/shared-JGroup-data/file.ping.dir"/>
<MERGE2 max_interval="30000"
min_interval="10000"/>
<FD_SOCK/>
<FD timeout="10000" max_tries="5" />
<VERIFY_SUSPECT timeout="1500" />
<BARRIER />
<pbcast.NAKACK
use_mcast_xmit="false"
retransmit_timeout="300,600,1200,2400,4800"
discard_delivered_msgs="true"/>
<UNICAST timeout="300,600,1200" />
<pbcast.STABLE stability_delay="1000" desired_avg_gossip="50000"
max_bytes="400000"/>
<pbcast.GMS print_local_addr="true" join_timeout="3000"
view_bundling="true"/>
<FC max_credits="2000000"
min_threshold="0.10"/>
<FRAG2 frag_size="60000" />
<pbcast.STATE_TRANSFER/>
<pbcast.FLUSH timeout="0"/>
</config>
The logs for master-broker.xml are
[root@devops-centos-1 bin]# ./artemis run
_ _ _
/ \ ____| |_ ___ __ __(_) _____
/ _ \| _ \ __|/ _ \ \/ | |/ __/
/ ___ \ | \/ |_/ __/ |\/| | |\___ \
/_/ \_\| \__\____|_| |_|_|/___ /
Apache ActiveMQ Artemis 2.15.0
2020-09-28 10:45:46,892 INFO [org.apache.activemq.artemis.integration.bootstrap] AMQ101000: Starting ActiveMQ Artemis Server
2020-09-28 10:45:46,938 INFO [org.apache.activemq.artemis.core.server] AMQ221000: live Message Broker is starting with configuration Broker Configuration (clustered=true,journalDirectory=/mnt/devops-nfs-share/shared-JGroup-data/data/journal,bindingsDirectory=/mnt/devops-nfs-share/shared-JGroup-data/data/bindings,largeMessagesDirectory=/mnt/devops-nfs-share/shared-JGroup-data/data/large-messages,pagingDirectory=/mnt/devops-nfs-share/shared-JGroup-data/data/paging)
2020-09-28 10:45:47,214 WARNING [org.jgroups.stack.Configurator] JGRP000014: TP.enable_bundling has been deprecated: will be ignored as bundling is on by default
2020-09-28 10:45:47,235 WARNING [org.jgroups.stack.Configurator] JGRP000014: UNICAST.setTimeout has been deprecated: not used anymore
-------------------------------------------------------------------
GMS: address=devops-centos-1-7492, cluster=active_broadcast_channel, physical address=172.16.20.129:45293
-------------------------------------------------------------------
2020-09-28 10:45:50,320 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: JOIN(devops-centos-1-7492) sent to devops-centos-2-12055 timed out (after 3000 ms), on try 1
2020-09-28 10:45:53,326 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: JOIN(devops-centos-1-7492) sent to devops-centos-2-12055 timed out (after 3000 ms), on try 2
2020-09-28 10:45:56,331 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: JOIN(devops-centos-1-7492) sent to devops-centos-2-12055 timed out (after 3000 ms), on try 3
2020-09-28 10:45:56,638 SEVERE [org.jgroups.protocols.TCP] JGRP000029: devops-centos-1-7492: failed sending message to devops-centos-2-12055 (103 bytes): java.net.SocketTimeoutException: connect timed out, headers: GMS: GmsHeader[JOIN_REQ]: mbr=devops-centos-1-7492, UNICAST: DATA, seqno=4, TP: [cluster_name=active_broadcast_channel]
2020-09-28 10:45:57,607 SEVERE [org.jgroups.protocols.TCP] JGRP000036: devops-centos-1-7492: exception sending bundled msgs: java.net.SocketTimeoutException: connect timed out
2020-09-28 10:45:59,335 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: JOIN(devops-centos-1-7492) sent to devops-centos-2-12055 timed out (after 3000 ms), on try 4
2020-09-28 10:45:59,641 SEVERE [org.jgroups.protocols.TCP] JGRP000034: devops-centos-1-7492: failure sending message to devops-centos-2-12055: java.net.SocketTimeoutException: connect timed out
2020-09-28 10:45:59,943 SEVERE [org.jgroups.protocols.TCP] JGRP000029: devops-centos-1-7492: failed sending message to devops-centos-2-12055 (103 bytes): java.net.SocketTimeoutException: connect timed out, headers: GMS: GmsHeader[JOIN_REQ]: mbr=devops-centos-1-7492, UNICAST: DATA, seqno=5, TP: [cluster_name=active_broadcast_channel]
2020-09-28 10:46:02,339 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: JOIN(devops-centos-1-7492) sent to devops-centos-2-12055 timed out (after 3000 ms), on try 5
2020-09-28 10:46:02,648 SEVERE [org.jgroups.protocols.TCP] JGRP000029: devops-centos-1-7492: failed sending message to devops-centos-2-12055 (103 bytes): java.net.SocketTimeoutException: connect timed out, headers: GMS: GmsHeader[JOIN_REQ]: mbr=devops-centos-1-7492, UNICAST: DATA, seqno=6, TP: [cluster_name=active_broadcast_channel]
2020-09-28 10:46:03,611 SEVERE [org.jgroups.protocols.TCP] JGRP000036: devops-centos-1-7492: exception sending bundled msgs: java.net.SocketTimeoutException: connect timed out
2020-09-28 10:46:05,346 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: JOIN(devops-centos-1-7492) sent to devops-centos-2-12055 timed out (after 3000 ms), on try 6
2020-09-28 10:46:05,654 SEVERE [org.jgroups.protocols.TCP] JGRP000029: devops-centos-1-7492: failed sending message to devops-centos-2-12055 (103 bytes): java.net.SocketTimeoutException: connect timed out, headers: GMS: GmsHeader[JOIN_REQ]: mbr=devops-centos-1-7492, UNICAST: DATA, seqno=7, TP: [cluster_name=active_broadcast_channel]
2020-09-28 10:46:08,350 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: JOIN(devops-centos-1-7492) sent to devops-centos-2-12055 timed out (after 3000 ms), on try 7
2020-09-28 10:46:08,658 SEVERE [org.jgroups.protocols.TCP] JGRP000034: devops-centos-1-7492: failure sending message to devops-centos-2-12055: java.net.SocketTimeoutException: connect timed out
2020-09-28 10:46:09,613 SEVERE [org.jgroups.protocols.TCP] JGRP000036: devops-centos-1-7492: exception sending bundled msgs: java.net.SocketTimeoutException: connect timed out
2020-09-28 10:46:11,354 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: JOIN(devops-centos-1-7492) sent to devops-centos-2-12055 timed out (after 3000 ms), on try 8
2020-09-28 10:46:11,661 SEVERE [org.jgroups.protocols.TCP] JGRP000034: devops-centos-1-7492: failure sending message to devops-centos-2-38597: java.net.SocketTimeoutException: connect timed out
2020-09-28 10:46:11,964 SEVERE [org.jgroups.protocols.TCP] JGRP000034: devops-centos-1-7492: failure sending message to devops-centos-2-12055: java.net.SocketTimeoutException: connect timed out
2020-09-28 10:46:13,616 SEVERE [org.jgroups.protocols.TCP] JGRP000036: devops-centos-1-7492: exception sending bundled msgs: java.net.SocketTimeoutException: connect timed out
2020-09-28 10:46:14,360 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: JOIN(devops-centos-1-7492) sent to devops-centos-2-12055 timed out (after 3000 ms), on try 9
2020-09-28 10:46:14,669 SEVERE [org.jgroups.protocols.TCP] JGRP000034: devops-centos-1-7492: failure sending message to devops-centos-2-12055: java.net.SocketTimeoutException: connect timed out
2020-09-28 10:46:15,615 SEVERE [org.jgroups.protocols.TCP] JGRP000036: devops-centos-1-7492: exception sending bundled msgs: java.net.SocketTimeoutException: connect timed out
2020-09-28 10:46:17,365 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: JOIN(devops-centos-1-7492) sent to devops-centos-2-12055 timed out (after 3000 ms), on try 10
2020-09-28 10:46:17,366 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-1-7492: too many JOIN attempts (10): becoming singleton
2020-09-28 10:46:19,400 WARNING [org.jgroups.protocols.pbcast.FLUSH] devops-centos-1-7492: waiting for UNBLOCK timed out after 2000 ms
2020-09-28 10:46:19,419 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-server]. Adding protocol support for: CORE
2020-09-28 10:46:19,420 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-amqp-protocol]. Adding protocol support for: AMQP
2020-09-28 10:46:19,420 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-hornetq-protocol]. Adding protocol support for: HORNETQ
2020-09-28 10:46:19,420 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-mqtt-protocol]. Adding protocol support for: MQTT
2020-09-28 10:46:19,420 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-openwire-protocol]. Adding protocol support for: OPENWIRE
2020-09-28 10:46:19,421 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-stomp-protocol]. Adding protocol support for: STOMP
2020-09-28 10:46:19,482 INFO [org.apache.activemq.artemis.core.server] AMQ221034: Waiting indefinitely to obtain live lock
2020-09-28 10:46:19,483 INFO [org.apache.activemq.artemis.core.server] AMQ221035: Live Server Obtained live lock
2020-09-28 10:46:20,251 INFO [org.apache.activemq.artemis.core.server]
2020-09-28 10:46:20,256 INFO [org.apache.activemq.artemis.core.server] AMQ221007: Server is now live
2020-09-28 10:46:20,257 INFO [org.apache.activemq.artemis.core.server] AMQ221001: Apache ActiveMQ Artemis Message Broker version 2.15.0 [artemis-master, nodeID=9bc1eb6d-015f-11eb-a1d5-0050569b585d]
2020-09-28 10:46:20,942 INFO [io.hawt.HawtioContextListener] Initialising hawtio services
2020-09-28 10:46:20,954 INFO [io.hawt.system.ConfigManager] Configuration will be discovered via system properties
2020-09-28 10:46:20,956 INFO [io.hawt.jmx.JmxTreeWatcher] Welcome to hawtio 1.5.12 : http://hawt.io/ : Don't cha wish your console was hawt like me? ;-)
2020-09-28 10:46:20,957 INFO [io.hawt.jmx.UploadManager] Using file upload directory: /opt/J-sharedMasterbroker/tmp/uploads
2020-09-28 10:46:20,968 INFO [io.hawt.web.AuthenticationFilter] Starting hawtio authentication filter, JAAS realm: "activemq" authorized role(s): "amq" role principal classes: "org.apache.activemq.artemis.spi.core.security.jaas.RolePrincipal"
2020-09-28 10:46:20,987 INFO [io.hawt.web.JolokiaConfiguredAgentServlet] Jolokia overridden property: [key=policyLocation, value=file:/opt/J-sharedMasterbroker/etc/jolokia-access.xml]
2020-09-28 10:46:21,005 INFO [io.hawt.web.RBACMBeanInvoker] Using MBean [hawtio:type=security,area=jmx,rank=0,name=HawtioDummyJMXSecurity] for role based access control
2020-09-28 10:46:21,080 INFO [io.hawt.system.ProxyWhitelist] Initial proxy whitelist: [localhost, 127.0.0.1, 172.16.20.129]
2020-09-28 10:46:21,257 INFO [org.apache.activemq.artemis] AMQ241001: HTTP Server started at http://0.0.0.0:8161
2020-09-28 10:46:21,258 INFO [org.apache.activemq.artemis] AMQ241002: Artemis Jolokia REST API available at http://0.0.0.0:8161/console/jolokia
2020-09-28 10:46:21,258 INFO [org.apache.activemq.artemis] AMQ241004: Artemis Console available at http://0.0.0.0:8161/console
Logs for slave-broker are
[root@devops-centos-2 bin]# ./artemis run
_ _ _
/ \ ____| |_ ___ __ __(_) _____
/ _ \| _ \ __|/ _ \ \/ | |/ __/
/ ___ \ | \/ |_/ __/ |\/| | |\___ \
/_/ \_\| \__\____|_| |_|_|/___ /
Apache ActiveMQ Artemis 2.15.0
2020-09-28 11:05:41,421 INFO [org.apache.activemq.artemis.integration.bootstrap] AMQ101000: Starting ActiveMQ Artemis Server
2020-09-28 11:05:41,449 INFO [org.apache.activemq.artemis.core.server] AMQ221000: backup Message Broker is starting with configuration Broker Configuration (clustered=true,journalDirectory=/mnt/devops-nfs-share/shared-JGroup-data/data/journal,bindingsDirectory=/mnt/devops-nfs-share/shared-JGroup-data/data/bindings,largeMessagesDirectory=/mnt/devops-nfs-share/shared-JGroup-data/data/large-messages,pagingDirectory=/mnt/devops-nfs-share/shared-JGroup-data/data/paging)
2020-09-28 11:05:41,457 INFO [org.apache.activemq.artemis.core.server] AMQ221032: Waiting to become backup node
2020-09-28 11:05:41,457 INFO [org.apache.activemq.artemis.core.server] AMQ221033: ** got backup lock
2020-09-28 11:05:41,502 INFO [org.apache.activemq.artemis.core.server] AMQ221012: Using AIO Journal
2020-09-28 11:05:41,545 INFO [org.apache.activemq.artemis.core.server] AMQ221057: Global Max Size is being adjusted to 1/2 of the JVM max size (-Xmx). being defined as 1,073,741,824
2020-09-28 11:05:41,785 INFO [org.apache.activemq.hawtio.branding.PluginContextListener] Initialized activemq-branding plugin
-------------------------------------------------------------------
GMS: address=devops-centos-2-55890, cluster=active_broadcast_channel, physical address=172.16.24.85:43241
-------------------------------------------------------------------
2020-09-28 11:05:41,841 INFO [org.apache.activemq.hawtio.plugin.PluginContextListener] Initialized artemis-plugin plugin
2020-09-28 11:05:42,167 INFO [io.hawt.HawtioContextListener] Initialising hawtio services
2020-09-28 11:05:42,179 INFO [io.hawt.system.ConfigManager] Configuration will be discovered via system properties
2020-09-28 11:05:42,181 INFO [io.hawt.jmx.JmxTreeWatcher] Welcome to hawtio 1.5.12 : http://hawt.io/ : Don't cha wish your console was hawt like me? ;-)
2020-09-28 11:05:42,183 INFO [io.hawt.jmx.UploadManager] Using file upload directory: /opt/J-sharedSlavebroker/tmp/uploads
2020-09-28 11:05:42,193 INFO [io.hawt.web.AuthenticationFilter] Starting hawtio authentication filter, JAAS realm: "activemq" authorized role(s): "amq" role principal classes: "org.apache.activemq.artemis.spi.core.security.jaas.RolePrincipal"
2020-09-28 11:05:42,212 INFO [io.hawt.web.JolokiaConfiguredAgentServlet] Jolokia overridden property: [key=policyLocation, value=file:/opt/J-sharedSlavebroker/etc/jolokia-access.xml]
2020-09-28 11:05:42,232 INFO [io.hawt.web.RBACMBeanInvoker] Using MBean [hawtio:type=security,area=jmx,rank=0,name=HawtioDummyJMXSecurity] for role based access control
2020-09-28 11:05:42,307 INFO [io.hawt.system.ProxyWhitelist] Initial proxy whitelist: [localhost, 127.0.0.1, 172.16.24.85, devops-centos-2.com]
2020-09-28 11:05:43,163 INFO [org.apache.activemq.artemis] AMQ241001: HTTP Server started at http://localhost:8161
2020-09-28 11:05:43,163 INFO [org.apache.activemq.artemis] AMQ241004: Artemis Console available at http://localhost:8161/console
2020-09-28 11:05:44,818 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-2-55890: JOIN(devops-centos-2-55890) sent to devops-centos-1-7492 timed out (after 3000 ms), on try 1
2020-09-28 11:05:47,822 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-2-55890: JOIN(devops-centos-2-55890) sent to devops-centos-1-7492 timed out (after 3000 ms), on try 2
2020-09-28 11:05:50,090 SEVERE [org.jgroups.protocols.TCP] JGRP000029: devops-centos-2-55890: failed sending message to devops-centos-1-7492 (103 bytes): java.net.SocketTimeoutException: connect timed out, headers: GMS: GmsHeader[JOIN_REQ]: mbr=devops-centos-2-55890, UNICAST: DATA, seqno=3, TP: [cluster_name=active_broadcast_channel]
2020-09-28 11:05:50,825 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-2-55890: JOIN(devops-centos-2-55890) sent to devops-centos-1-7492 timed out (after 3000 ms), on try 3
2020-09-28 11:05:51,131 SEVERE [org.jgroups.protocols.TCP] JGRP000034: devops-centos-2-55890: failure sending message to devops-centos-1-7492: java.net.SocketTimeoutException: connect timed out
2020-09-28 11:05:52,091 SEVERE [org.jgroups.protocols.TCP] JGRP000036: devops-centos-2-55890: exception sending bundled msgs: java.net.SocketTimeoutException: connect timed out
2020-09-28 11:05:53,829 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-2-55890: JOIN(devops-centos-2-55890) sent to devops-centos-1-7492 timed out (after 3000 ms), on try 4
2020-09-28 11:06:03,147 SEVERE [org.jgroups.protocols.TCP] JGRP000034: devops-centos-2-55890: failure sending message to devops-centos-1-7492: java.net.SocketTimeoutException: connect timed out
2020-09-28 11:06:04,095 SEVERE [org.jgroups.protocols.TCP] JGRP000036: devops-centos-2-55890: exception sending bundled msgs: java.net.SocketTimeoutException: connect timed out
2020-09-28 11:06:05,844 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-2-55890: JOIN(devops-centos-2-55890) sent to devops-centos-1-7492 timed out (after 3000 ms), on try 8
2020-09-28 11:06:06,149 SEVERE [org.jgroups.protocols.TCP] JGRP000034: devops-centos-2-55890: failure sending message to devops-centos-1-18963: java.net.SocketTimeoutException: connect timed out
2020-09-28 11:06:06,451 SEVERE [org.jgroups.protocols.TCP] JGRP000034: devops-centos-2-55890: failure sending message to devops-centos-1-7492: java.net.SocketTimeoutException: connect timed out
2020-09-28 11:06:08,098 SEVERE [org.jgroups.protocols.TCP] JGRP000029: devops-centos-2-55890: failed sending message to devops-centos-1-7492 (103 bytes): java.net.SocketTimeoutException: connect timed out, headers: GMS: GmsHeader[JOIN_REQ]: mbr=devops-centos-2-55890, UNICAST: DATA, seqno=9, TP: [cluster_name=active_broadcast_channel]
2020-09-28 11:06:08,847 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-2-55890: JOIN(devops-centos-2-55890) sent to devops-centos-1-7492 timed out (after 3000 ms), on try 9
2020-09-28 11:06:09,153 SEVERE [org.jgroups.protocols.TCP] JGRP000034: devops-centos-2-55890: failure sending message to devops-centos-1-7492: java.net.SocketTimeoutException: connect timed out
2020-09-28 11:06:10,098 SEVERE [org.jgroups.protocols.TCP] JGRP000036: devops-centos-2-55890: exception sending bundled msgs: java.net.SocketTimeoutException: connect timed out
2020-09-28 11:06:11,851 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-2-55890: JOIN(devops-centos-2-55890) sent to devops-centos-1-7492 timed out (after 3000 ms), on try 10
2020-09-28 11:06:11,851 WARNING [org.jgroups.protocols.pbcast.GMS] devops-centos-2-55890: too many JOIN attempts (10): becoming singleton
2020-09-28 11:06:13,869 WARNING [org.jgroups.protocols.pbcast.FLUSH] devops-centos-2-55890: waiting for UNBLOCK timed out after 2000 ms
2020-09-28 11:06:13,893 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-server]. Adding protocol support for: CORE
2020-09-28 11:06:13,893 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-amqp-protocol]. Adding protocol support for: AMQP
2020-09-28 11:06:13,893 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-hornetq-protocol]. Adding protocol support for: HORNETQ
2020-09-28 11:06:13,894 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-mqtt-protocol]. Adding protocol support for: MQTT
2020-09-28 11:06:13,894 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-openwire-protocol]. Adding protocol support for: OPENWIRE
2020-09-28 11:06:13,894 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-stomp-protocol]. Adding protocol support for: STOMP
2020-09-28 11:06:13,943 INFO [org.apache.activemq.artemis.core.server] AMQ221109: Apache ActiveMQ Artemis Backup Server version 2.15.0 [9bc1eb6d-015f-11eb-a1d5-0050569b585d] started, waiting live to fail before it gets active
2020-09-28 11:06:23,946 WARN [org.apache.activemq.artemis.core.server] AMQ222137: Unable to announce backup, retrying: ActiveMQConnectionTimedOutException[errorType=CONNECTION_TIMEDOUT message=AMQ219012: Timed out waiting to receive initial broadcast from cluster] at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.executeDiscovery(ServerLocatorImpl.java:767) [artemis-core-client-2.15.0.jar:2.15.0] at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.createSessionFactory(ServerLocatorImpl.java:655) [artemis-core-client-2.15.0.jar:2.15.0] at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:549) [artemis-core-client-2.15.0.jar:2.15.0] at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:528) [artemis-core-client-2.15.0.jar:2.15.0] at org.apache.activemq.artemis.core.server.cluster.BackupManager$BackupConnector$1.run(BackupManager.java:267) [artemis-server-2.15.0.jar:2.15.0] at org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:42) [artemis-commons-2.15.0.jar:2.15.0] at org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:31) [artemis-commons-2.15.0.jar:2.15.0] at org.apache.activemq.artemis.utils.actors.ProcessorBase.executePendingTasks(ProcessorBase.java:65) [artemis-commons-2.15.0.jar:2.15.0] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [rt.jar:1.8.0_265]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [rt.jar:1.8.0_265]
at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118) [artemis-commons-2.15.0.jar:2.15.0]
2020-09-28 11:06:34,450 WARN [org.apache.activemq.artemis.core.server] AMQ222137: Unable to announce backup, retrying: ActiveMQConnectionTimedOutException[errorType=CONNECTION_TIMEDOUT message=AMQ219012: Timed out waiting to receive initial broadcast from cluster]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.executeDiscovery(ServerLocatorImpl.java:767) [artemis-core-client-2.15.0.jar:2.15.0]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.createSessionFactory(ServerLocatorImpl.java:655) [artemis-core-client-2.15.0.jar:2.15.0]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:549) [artemis-core-client-2.15.0.jar:2.15.0]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:528) [artemis-core-client-2.15.0.jar:2.15.0]
at org.apache.activemq.artemis.core.server.cluster.BackupManager$BackupConnector$1.run(BackupManager.java:267) [artemis-server-2.15.0.jar:2.15.0]
at org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:42) [artemis-commons-2.15.0.jar:2.15.0]
at org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:31) [artemis-commons-2.15.0.jar:2.15.0]
at org.apache.activemq.artemis.utils.actors.ProcessorBase.executePendingTasks(ProcessorBase.java:65) [artemis-commons-2.15.0.jar:2.15.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [rt.jar:1.8.0_265]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [rt.jar:1.8.0_265]
at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118) [artemis-commons-2.15.0.jar:2.15.0]
Is there any way to send messages without disabling the firewalld service.