Unable to connect to database error
I recommend checking the database information again. After importing the database, you have to create a new database user, then add the user to the database. This step is required, since users are not typically imported with the database.
Then confirm that this new user is updated in the php settings.
Also make sure your Hostname is:
If it is still not working, your host may be experiencing issues with some of its services, particularly SQL.
I hope this helps,