JBoss already has an embedded Tomcat service and it's console applications are served through this. Having a running instance of Tomcat will prevent the JBoss Tomcat instance from starting. You should disable your standalone Tomcat version.
Alternatively, you can move the JBoss Tomcat connectors to other ports. You do that by editing the JBOSS_HOME/default/server/default/jbossweb-tomcat41.sar/META-INF/jboss-service.xml file - it is similar to the server.xml file for Tomcat, with regard to connector configuration.