So I decided to change the port of the Oracle HTTP listener doing the following with SQLPlus:
C:\>sqlplus / as sysdba SQL*Plus: Release 10.2.0.1.0 - Production on Sat Sep 10 18:49:14 2006 Copyright (c) 1982, 2005, Oracle. All rights reserved. Connected to: Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production SQL> exec dbms_xdb.sethttpport(8081); PL/SQL procedure successfully completed. SQL>