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XDB username and password required


When installing Apex on 12cR2 multitenant this popup appears: 


This Popup appears when user : ANONYMOUS status is LOCKED or EXPIRED .

Solution: 
Connect as sysdba to CDB$root then alter user account status: 

SQL> select account_status from dba_users where username='ANONYMOUS';

ACCOUNT_STATUS
--------------------------------
EXPIRED & LOCKED

SQL> alter user ANONYMOUS ACCOUNT UNLOCK;

SQL> select account_status from dba_users where username='ANONYMOUS';

ACCOUNT_STATUS
--------------------------------
EXPIRED

SQL> alter user ANONYMOUS identified by ANONYMOUS  ACCOUNT UNLOCK;

  user Altered..

SQL> select account_status from dba_users where username='ANONYMOUS';

ACCOUNT_STATUS
--------------------------------
OPEN


Hope this help.. 

if you still having troubles then alter the following user

ALTER USER APEX_PUBLIC_USER IDENTIFIED BY APEX_PUBLIC_USER ACCOUNT UNLOCK;

Thank you.