Web AS 6.40 Sneak Preview: Problems with monitoring Database with SQL Studi

Hello!
I'm new with SAP and SAP Web AS, and I installed the SAP Web AS 6.40 Sneak Preview recently. I'm exercizing with the tutorials, and in the Tutorial "Car rental Application", a "QCR_RESERVATION" database is created and deployed.
The deployment worked fine, but I'm having problems accessing the SAP DB with SQL Studio.
At first, I didn't find SQL studio in my SAP installation, so I installed it afterwards. I now tried to log on with the data mentioned in the tutorial (localhost, C11, SAPC11DB and "sap"), and got the error "Database not running (-709)". Looking at the SAP Management Console, I found a database with the name "J2E", so I tried this one.
But now the problem is, that with user SAPJ2EDB and password "sap", I get the error "(-4008) Unknown username and password", and the same error with the combination "control", "control".
What is my mistake? Could anybody give me a hint? Maybe there is something wrong with my Web AS 6.40 Sneak Preview Installation? I don't remember having changed any settings during installation ...
Thank you in advance
Bärbel Wolf

Dale, thank you very much.
Your hint really is useful, I know myself, I'd most probably need unlocking my admin user soon. )
But nevertheless, I'm still looking for the right password for the database user "SAPJ2EDB".
As I'm encountering problems with the "Quick Car Reservation" tutorial (the entity bean seems unable to access the database, too), I'd like to check the QCR_RESERVATION database with my SQL Studio. Maybe there's something wrong with it.
Greetings
Bärbel

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