you forgot the password of EM for OAS 10.1.2

If you forgot the password of EM

 

 

To Reset the ias_admin password while you are logged in as the user who installed the Oracle Application Server instance:

 

1.     Stop the Application Server Control.
On UNIX systems ORACLE_HOME/bin/emctl stop iasconsole
On Windows systems, use the Services control panel to stop the Application Server Control service.

2.     Locate and open the following file in a text editor:
ORACLE_HOME/sysman/j2ee/config/jazn-data.xml

3.     Locate the line that defines the credentials property for the ias_admin user.
and under line <name>enterprise-manager</name> you find <name>ias_admin</name>. Under this line you find the password in encrypted form like
<credentials>{903}buG0lUsQqTq0nQRECL1kbs192mP</credentials>

4.     so delete the old password and write the new password in this form
<credentials>!mynewpassword123</credentials>

5.    Start the Application Server Control.

See also:

http://download.oracle.com/docs/cd/B15904_01/core.1012/b13995/trouble_asc.htm#BCEDHFEI