Accessing Enterprise Manager Database Express 12c

Connect to your database:-

$ sqlplus / as sysdba

SQL> select dbms_xdb_config.gethttpsport() from dual;

DBMS_XDB_CONFIG.GETHTTPSPORT()
------------------------------
0

SQL> exec dbms_xdb_config.sethttpsport(5501);
PL/SQL procedure successfully completed.

SQL> execute dbms_xdb_config.setglobalportenabled(TRUE);