i can't login to my admin siteaccess. User site works fine. Admin site shows a blank, empty page with no error message, no data, no html code whatsoever.
like you posted, if you can't get a database connection there might be a number of checks to do. But first of all, you can check in site.ini or site.ini.append.php (of the admin siteaccess) if the name of the database, user and password are correct. Also the connection type and the host address.