I've been using correct info (which happened to work with Wordpress) again & again, but I just cannot validate my database settings.
Is it possible to work things around: getting the definitive php files (or being told which ones are affected, if they're already in the installation package) and editing them with my hosting & database info, the way you're allowed to do it with Wordpress?
premium.wpmudev.org/manuals/wpmu-manual-2/creating-and-editing-your-wp-config-php-file/