JBoss tries to connect to port 1521 even if a different port is configured for the Datasource

Issue

• DB is running on a port other than 1521, still JBoss is trying to open port 1521. Since JBoss is running behind a firewall,
  there is very limited access to the ports. Due to this JBoss server fails to connect to the DB using datasource throwing
  the following error:

IJ000610: Unable to fill pool: javax.resource.ResourceException: Could not create connection
        at org.jboss.jca.adapters.jdbc.xa.XAManagedConnectionFactory.getXAManagedConnection(XAManagedConnectionFactory.java:460)
        at org.jboss.jca.adapters.jdbc.xa.XAManagedConnectionFactory.createManagedConnection(XAManagedConnectionFactory.java:397)

Caused by: my.NetException: The Network Adapter could not establish the connection
        at com.myProtocol.connect(myProtocol.java:333)
        at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1042)
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:301)
        ... 14 more
Caused by: .ConnectException: Connection timed out
        at .PlainSocketImpl.socketConnect(Native Method)
        at .PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
        at .PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
        at .PlainSocketImpl.connect(PlainSocketImpl.java:200)
        at .SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at .Socket.connect(Socket.java:529)