Wordpress "Error establishing a database connection"

Hi All

Recently i buy WD mycloud ex4, then i tried to install Wordpress.

Installation successfull, but when try to configure it, comes the error "

Error establishing a database connection

as information

firmware : 1.05.30

Wordpress version : 1.03 (automatically installed by sytem and no other choice)

phpmyadmin :  asscesible


If you have any other app running at the same time, try to disable it only as a troubleshooting step.