It is obvious that you will get error after changing password : Error Establishing database connection .
Copy your new password and paste the new password in config file of your CMS , Script , web portal .
Comman conify files are :
For wordpress : wp-config.php
or configuration.php / config.php , connect.php etc .
Save the changes and your cms will start to work again . Change configuration file permission to 400 for additional security !
Sunday, July 28, 2013