Error establishing a database connection

Things seems to come to live when from the setup-config.php page (launched from my browser),I substitute DB User (which should be wordpress) with my name and substitute localhost with 192.168.0.2 (which is my NAS IP).I have the following message :

All right sparky! You've made it through this part of the installation. WordPress can now communicate with your database. If you are ready, time now to…

And unfortunately just after I press on the 'Run the install' button :

Error establishing a database connection
This either means that the username and password information in your wp-config.php file is incorrect or we can't contact the database server at 192.168.0.2. This could mean your host's database server is down.

Are you sure you have the correct username and password?
Are you sure that you have typed the correct hostname?
Are you sure that the database server is running?
If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.