Unfortunately, If you are forgotten the Apex Admin password on oracle server. We can be reset it again with new password,

Login into your SQL Server,  

#  sqlplus /nolog  

SQL> connect sys/password as sysdba   



Connected to:



Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production

 
 

Then run the below command (apxchpwd.sql) and enter a new password. Password will be changed.

SQL> @@/u01/app/oracle/product/11.2.0/xe/apex/apxchpwd.sql

Enter a value below for the password for the Application Express ADMIN user.



Enter a password for the ADMIN user              [] 



Session altered.



...changing password for ADMIN



PL/SQL procedure successfully completed.



Commit complete.



SQL> exit

  
 

Open the browser and give new password.



Now, change new password as your wish,