AS400 Datasource connection errors

Issue

• server.log entries similar to

WARN  [org.jboss.jca.core.connectionmanager.pool.strategy.OnePool] (ServerService Thread Pool -- 86) IJ000604: Throwable while attempting to get a new connection: null: javax.resource.ResourceException: Could not create connection
...
[Server:<server>] Caused by: java.sql.SQLException: The application requester cannot establish the connection. (Connection refused)
[Server:<server>]  at com.ibm.as400.access.JDError.throwSQLException(JDError.java:528)
[Server:<server>]  at com.ibm.as400.access.AS400JDBCConnection.setProperties(AS400JDBCConnection.java:2856)
[Server:<server>]  at com.ibm.as400.access.AS400JDBCDriver.prepareConnection(AS400JDBCDriver.java:1242)
[Server:<server>]  at com.ibm.as400.access.AS400JDBCDriver.initializeConnection(AS400JDBCDriver.java:1105)
[Server:<server>]  at com.ibm.as400.access.AS400JDBCDriver.connect(AS400JDBCDriver.java:355)
[Server:<server>]  at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:328) [ironjacamar-jdbc-1.0.31.Final-redhat-1.jar:1.0.31.Final-redhat-1]