You had the host name specified wrong in your connection file. I thought that was the issue, but it still happens after I updated it. I'd still download the connection file with the update I made.
Maybe send that page to your hosting provider. Based on the error I'd say the database server setting is wrong. Can you see the database when going in through phpMyAdmin? Can you give me access to look there? There seems to be something wrong with your connection information or the server configuration itself.