I have same problem. After I installed the ILMA, I tried to login from the home page http://hostname:7777/pls/apex/f?p=737677 . The username is ADMIN and the password is apex-password (password of Application Express schema owner or FLOWS_030000) . In addition, CTXSYS, FLOWS_030000, XDB, APEX_PUBLIC_USER, ANONYMOUS, ILM_TOOLKIT and FLOWS_FILES have exactly the same password 'apexpwd'.
After I entered the username,password and clicked OK , nothing happened. If I checked the 'Remember my password', I got the message 'Unauthorized'.