Ora-01017 error starting J2EE: logon refused

I'm usig Web As 640 Abap+Java Sp16.

I was not able to logon anymore to the J2EE, both Visual Admin or vie the J2EE Start Page, so i did the following:

1) i checked in config tool wich was the ume.r3.connection.master.client

2)with SU01 in the Was 640, into the master client i changed the psw for J2EE_ADMIN

3) i logged with J2EE_ADMIN to define a definitive psw into the master client

4) with config tool i selected the 'Secure Store' node, and changed the parameter admin/password/J2EE_ADMIN

5) restarted the J2EE server and......

...it does not come up.

Into the jvm_bootstrap.log we see the msg :

"ORA-01017 invalid username/passoword, logon denied

What's wrong ? About wich user/psw is talking about and how I can modify it as I cannot start the configtool also ?

regards