I had same problem, i am trying to login database it appear a message with: "ORA-28001: The password has expired" , I have fixed the problem simple steps
1.open command prompt 2.type sqlplus 3.It will ask Enter Password, you can give old password, it will show password has expired ORA-28001 4.It will ask new password and retype password 5.It will change with new password 6.Go to the sql database and try to connect with new password, it will connect.