1.
sql>conn / as sysdba;
provide password ur password.
sql>alter user identified by

2.
start your database.
command prompt: netstat -an | find "TCP"
check for the ip and port, status.
ping the ip address.

if not, change the port:8080
sql>exec dbms_xdb.sethttpport(8090);
sql>exec dbms_xdb.setlistenerlocalaccess(true);<-- should be true
now: 127.0.0.1:8090
try doing these, may work.

cheers!