WARN/ERROR message "WFLYPRT0053: Could not connect to http-remoting://127.0.0.1:9990. The connection failed" when trying to start the Process Automation Manager/Decision Manager

Issue

• During server restart the following ERROR/WARN messages are logged:

  ...
  ... WARN  [org.kie.workbench.common.screens.datasource.management.backend.DataSourceManagementBootstrap] (pool-14-thread-1) Initialize deployments task finished with errors: It was not possible to open connection to server. java.net.ConnectException: WFLYPRT0053: Could not connect to http-remoting://127.0.0.1:9990. The connection failed
  ... ERROR [org.kie.workbench.common.screens.datasource.management.backend.DataSourceManagementBootstrap] (pool-14-thread-1) No more retries are available, some drivers or datasources might not work properly. It was not possible to open connection to server. java.net.ConnectException: WFLYPRT0053: Could not connect to http-remoting://127.0.0.1:9990. The connection failed: java.lang.Exception: It was not possible to open connection to server. java.net.ConnectException: WFLYPRT0053: Could not connect to http-remoting://127.0.0.1:9990. The connection failed
  ...
  ... ERROR [org.uberfire.ext.security.management.wildfly.cli.BaseWildflyCLIManager] (default task-6) Error reading realm using CLI commands.: java.io.IOException: java.net.ConnectException: WFLYPRT0053: Could not connect to remote+http://127.0.0.1:9990. The connection failed
  ... 
  Caused by: java.net.ConnectException: WFLYPRT0053: Could not connect to remote+http://127.0.0.1:9990. The connection failed
  ...
  ... ERROR [org.uberfire.ext.security.management.BackendUserSystemManager] (default task-6) UsersManagementService initialization failure: java.lang.RuntimeException: Properties file for users not found at './standalone/configuration/application-users.properties'.