Just go to the directory $ORACLE_HOME/sysman/j2ee/conf. In this directory you'll find the configuration file jazn-data.xml. Inside this configuration file you'll find the definition of the ias_admin user including his encrypted password:
Here's my own ORACLE_Home Path : c:\oracle\FRHome_1\sysman\j2ee\config\jazn-data.xml
- snippet from jazn-data.xml
- snippet from jazn-data.xml
- emctl stop iasconsole
- emctl start iasconsole
Now you can login with your new password and inside the jazn-data.xml the provided password in clear text is automatically changed into an encrypted password.
Thanks to Dirk Nachbar