I have installed and configured APEX 5.1.4 with embedded PL/SQL Gateway with Oracle 12c 18.104.22.168.0 database. Following this document: https://docs.oracle.com/cd/E71588_01/HTMIG/downloading-and-installing-Oracle-AE.htm#HTMIG29341
Even after resetting following script, not able to access the application:
Not able to login to APEX Administration Services http://<hostname>:8080/apex/apex_admin.
It is not prompting any error or warning message.
Here is the solution of XDB login
[SOLUTION] – Oracle APEX – XDB Authentication Popup dialog | Uma Anand Ilango
I hope that helps.