Hi @TimV
I still have no luck after following the guide you've provided on setting up the basic security.
Not sure if below log could help to find out the problem or actually this wasn't the actual log we're looking for?
Once again, thank you so much.
[2022-05-19T08:16:35,843][INFO ][o.e.n.Node ] [elasticsearch-test-v] version[7.17.3], pid[1391], build[default/rpm/5ad023604c8d7416c9eb6c0eadb62b14e766caff/2022-04-19T08:11:19.070913226Z], OS[Linux/4.18.0-193.80.1.el8_2.x86_64/amd64], JVM[Eclipse Adoptium/OpenJDK 64-Bit Server VM/18/18+36]
[2022-05-19T08:16:35,877][INFO ][o.e.n.Node ] [elasticsearch-test-v] JVM home [/usr/share/elasticsearch/jdk], using bundled JDK [true]
[2022-05-19T08:16:35,877][INFO ][o.e.n.Node ] [elasticsearch-test-v] JVM arguments [-Xshare:auto, -Des.networkaddress.cache.ttl=60, -Des.networkaddress.cache.negative.ttl=10, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -XX:-OmitStackTraceInFastThrow, -XX:+ShowCodeDetailsInExceptionMessages, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dio.netty.allocator.numDirectArenas=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Dlog4j2.formatMsgNoLookups=true, -Djava.locale.providers=SPI,COMPAT, --add-opens=java.base/java.io=ALL-UNNAMED, -Djava.security.manager=allow, -XX:+UseG1GC, -Djava.io.tmpdir=/tmp/elasticsearch-12016941505707016183, -XX:+HeapDumpOnOutOfMemoryError, -XX:+ExitOnOutOfMemoryError, -XX:HeapDumpPath=/var/lib/elasticsearch, -XX:ErrorFile=/var/log/elasticsearch/hs_err_pid%p.log, -Xlog:gc*,gc+age=trace,safepoint:file=/var/log/elasticsearch/gc.log:utctime,pid,tags:filecount=32,filesize=64m, -Xms1888m, -Xmx1888m, -XX:MaxDirectMemorySize=989855744, -XX:G1HeapRegionSize=4m, -XX:InitiatingHeapOccupancyPercent=30, -XX:G1ReservePercent=15, -Des.path.home=/usr/share/elasticsearch, -Des.path.conf=/etc/elasticsearch, -Des.distribution.flavor=default, -Des.distribution.type=rpm, -Des.bundled_jdk=true]
[2022-05-19T08:16:41,199][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [aggs-matrix-stats]
[2022-05-19T08:16:41,200][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [analysis-common]
[2022-05-19T08:16:41,200][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [constant-keyword]
[2022-05-19T08:16:41,200][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [frozen-indices]
[2022-05-19T08:16:41,200][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [ingest-common]
[2022-05-19T08:16:41,200][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [ingest-geoip]
[2022-05-19T08:16:41,200][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [ingest-user-agent]
[2022-05-19T08:16:41,200][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [kibana]
[2022-05-19T08:16:41,201][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [lang-expression]
[2022-05-19T08:16:41,201][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [lang-mustache]
[2022-05-19T08:16:41,201][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [lang-painless]
[2022-05-19T08:16:41,201][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [legacy-geo]
[2022-05-19T08:16:41,201][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [mapper-extras]
[2022-05-19T08:16:41,201][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [mapper-version]
[2022-05-19T08:16:41,201][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [parent-join]
[2022-05-19T08:16:41,202][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [percolator]
[2022-05-19T08:16:41,202][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [rank-eval]
[2022-05-19T08:16:41,202][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [reindex]
[2022-05-19T08:16:41,204][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [repositories-metering-api]
[2022-05-19T08:16:41,204][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [repository-encrypted]
[2022-05-19T08:16:41,204][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [repository-url]
[2022-05-19T08:16:41,205][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [runtime-fields-common]
[2022-05-19T08:16:41,205][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [search-business-rules]
[2022-05-19T08:16:41,205][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [searchable-snapshots]
[2022-05-19T08:16:41,205][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [snapshot-repo-test-kit]
[2022-05-19T08:16:41,205][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [spatial]
[2022-05-19T08:16:41,205][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [systemd]
[2022-05-19T08:16:41,205][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [transform]
[2022-05-19T08:16:41,206][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [transport-netty4]
[2022-05-19T08:16:41,206][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [unsigned-long]
[2022-05-19T08:16:41,206][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [vector-tile]
[2022-05-19T08:16:41,206][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [vectors]
[2022-05-19T08:16:41,206][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [wildcard]
[2022-05-19T08:16:41,206][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [x-pack-aggregate-metric]
[2022-05-19T08:16:41,206][INFO ][o.e.p.PluginsService ] [elasticsearch-test-v] loaded module [x-pack-analytics]