Security issue in downgrading JBoss EAP 7.4 from Java 11 to Java 8 - jboss

Question

I am fixing some issues while upgrading from PAM/JBPM 7.9 to 7.12 and with JBoss EAP going from 7.3 to 7.4. To make sure my environment mimics the test server, I tried to downgrade from the Java 11 on my machine to the test server's Openjdk version 8. After changing the Java version, I compensated for a few old certificates, reimported them into keystores and debugged a few errors in the the JBoss logs. However, I seem stuck on what seems like a security issue that has the following symptoms:
At the JBoss console the address of the console (https://127.0.0.1:9993/console/index.html) is being noted in the browser as "Not secure".
I cannot log in to Business Central (Login failed: Not Authorized) despite having used add-user to update the password in application-users.properties. I did this in case the file copied from 7.3 was made using a different level of security than the security in my 7.4 installation.
Kieserver cannot interact with Business Central. I used add-user to update the password for the kieserver account as well. The error message for this is
11:28:15,352 WARN [org.kie.server.services.impl.controller.DefaultRestControllerImpl] (KieServer-ControllerConnect) Exception encountered while syncing with controller at http://localhost:8080/business-central/rest/controller/server/default-kieserver error Error while sending PUT request to http://localhost:8080/business-central/rest/controller/server/default-kieserver response code 405
I have seen similar warning when kie-server cannot reach the backend database but the datasource tests fine and I can connect to the database using the kieserver's credentials.
I see a logged error about the same port, but I am not sure if it is related to the EAP console or PAM
11:28:23,080 INFO [org.xnio.nio] (pool-28-thread-1) XNIO NIO Implementation Version 3.8.4.Final-redhat-00001
11:28:23,210 ERROR [org.kie.workbench.common.screens.datasource.management.backend.integration.wildfly.WildflyBaseClient] (pool-28-thread-1) It was not possible to open connection to Wildfly/EAP server.: java.io.IOException: java.net.ConnectException: WFLYPRT0053: Could not connect to http-remoting://127.0.0.1:9990. The connection failed
at org.jboss.as.controller.client.impl.AbstractModelControllerClient.executeForResult(AbstractModelControllerClient.java:149)
at org.jboss.as.controller.client.impl.AbstractModelControllerClient.execute(AbstractModelControllerClient.java:80)
at org.kie.workbench.common.screens.datasource.management.backend.integration.wildfly.WildflyBaseClient.testConnection(WildflyBaseClient.java:158)
at org.kie.workbench.common.screens.datasource.management.backend.integration.wildfly.WildflyBaseClient.testConnection(WildflyBaseClient.java:147)
at org.kie.workbench.common.screens.datasource.management.backend.core.wildfly.WildflyDriverProvider.hasStarted(WildflyDriverProvider.java:210)
at org.kie.workbench.common.screens.datasource.management.backend.core.wildfly.WildflyDriverProvider$Proxy$_$$_WeldClientProxy.hasStarted(Unknown Source)
at org.kie.workbench.common.screens.datasource.management.backend.core.impl.DataSourceRuntimeManagerImpl.hasStarted(DataSourceRuntimeManagerImpl.java:199)
at org.kie.workbench.common.screens.datasource.management.backend.core.impl.DataSourceRuntimeManagerImpl$Proxy$_$$_WeldClientProxy.hasStarted(Unknown Source)
at org.kie.workbench.common.screens.datasource.management.backend.DataSourceManagementBootstrap.lambda$getInitializeDeploymentsTask$0(DataSourceManagementBootstrap.java:172)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.ConnectException: WFLYPRT0053: Could not connect to http-remoting://127.0.0.1:9990. The connection failed
at org.jboss.as.protocol.ProtocolConnectionUtils.checkFuture(ProtocolConnectionUtils.java:145)
at org.jboss.as.protocol.ProtocolConnectionUtils.connectSync(ProtocolConnectionUtils.java:125)
at org.jboss.as.protocol.ProtocolConnectionManager$EstablishingConnection.connect(ProtocolConnectionManager.java:259)
at org.jboss.as.protocol.ProtocolConnectionManager.connect(ProtocolConnectionManager.java:70)
at org.jboss.as.protocol.mgmt.ManagementClientChannelStrategy$Establishing.getChannel(ManagementClientChannelStrategy.java:167)
at org.jboss.as.controller.client.impl.RemotingModelControllerClient.getOrCreateChannel(RemotingModelControllerClient.java:132)
at org.jboss.as.controller.client.impl.RemotingModelControllerClient$2.getChannel(RemotingModelControllerClient.java:85)
at org.jboss.as.protocol.mgmt.ManagementChannelHandler.executeRequest(ManagementChannelHandler.java:135)
at org.jboss.as.protocol.mgmt.ManagementChannelHandler.executeRequest(ManagementChannelHandler.java:110)
at org.jboss.as.controller.client.impl.AbstractModelControllerClient.executeRequest(AbstractModelControllerClient.java:263)
at org.jboss.as.controller.client.impl.AbstractModelControllerClient.execute(AbstractModelControllerClient.java:168)
at org.jboss.as.controller.client.impl.AbstractModelControllerClient.executeForResult(AbstractModelControllerClient.java:147)
... 15 more
Caused by: org.xnio.http.RedirectException: XNIO000816: Redirect encountered establishing connection
at org.xnio.http.HttpUpgrade$HttpUpgradeState.handleRedirect(HttpUpgrade.java:513)
at org.xnio.http.HttpUpgrade$HttpUpgradeState.access$1300(HttpUpgrade.java:165)
at org.xnio.http.HttpUpgrade$HttpUpgradeState$UpgradeResultListener.handleEvent(HttpUpgrade.java:468)
at org.xnio.http.HttpUpgrade$HttpUpgradeState.flushUpgradeChannel(HttpUpgrade.java:369)
at org.xnio.http.HttpUpgrade$HttpUpgradeState.access$900(HttpUpgrade.java:165)
at org.xnio.http.HttpUpgrade$HttpUpgradeState$ConnectionOpenListener.handleEvent(HttpUpgrade.java:340)
at org.xnio.http.HttpUpgrade$HttpUpgradeState$ConnectionOpenListener.handleEvent(HttpUpgrade.java:320)
at org.xnio.http.HttpUpgrade$HttpUpgradeState.upgradeExistingConnection(HttpUpgrade.java:315)
at org.xnio.http.HttpUpgrade.performUpgrade(HttpUpgrade.java:144)
at org.jboss.remoting3.remote.HttpUpgradeConnectionProvider$UpgradeListener.handleEvent(HttpUpgradeConnectionProvider.java:174)
at org.jboss.remoting3.remote.HttpUpgradeConnectionProvider$UpgradeListener.handleEvent(HttpUpgradeConnectionProvider.java:153)
at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
at org.xnio.nio.WorkerThread$ConnectHandle.handleReady(WorkerThread.java:333)
at org.xnio.nio.WorkerThread.run(WorkerThread.java:591)
at ...asynchronous invocation...(Unknown Source)
at org.jboss.remoting3.EndpointImpl.connect(EndpointImpl.java:599)
at org.jboss.remoting3.EndpointImpl.connect(EndpointImpl.java:561)
at org.jboss.remoting3.EndpointImpl.connect(EndpointImpl.java:549)
at org.jboss.as.protocol.ProtocolConnectionUtils.connect(ProtocolConnectionUtils.java:227)
at org.jboss.as.protocol.ProtocolConnectionUtils.connectSync(ProtocolConnectionUtils.java:121)
... 25 more
These are my interfaces and socket binding's in standalone.xml
<interfaces>
<interface name="management">
<inet-address value="${jboss.bind.address.management:127.0.0.1}"/>
</interface>
<interface name="public">
<inet-address value="${jboss.bind.address:127.0.0.1}"/>
</interface>
<interface name="unsecure">
<inet-address value="${jboss.bind.address.unsecure:0.0.0.0}"/>
</interface>
</interfaces>
<socket-binding-group name="standard-sockets" default-interface="public" port-offset="${jboss.socket.binding.port-offset:0}">
<socket-binding name="ajp" port="${jboss.ajp.port:8009}"/>
<socket-binding name="http" port="${jboss.http.port:8080}"/>
<socket-binding name="https" port="${jboss.https.port:8443}"/>
<socket-binding name="iiop" interface="unsecure" port="3538"/>
<socket-binding name="iiop-ssl" interface="unsecure" port="3539"/>
<socket-binding name="management-http" interface="management" port="${jboss.management.http.port:9990}"/>
<socket-binding name="management-https" interface="management" port="${jboss.management.https.port:9993}"/>
<socket-binding name="txn-recovery-environment" port="4712"/>
<socket-binding name="txn-status-manager" port="4713"/>
</socket-binding-group>
What is the best way to investigate or fix this security issue?