I'm running a WordPress Multi Site installation, which I seem to have destroyed.
I created the installation with Plesk.
I cannot export dump the database, and checking it for errors says that it has none.
Now I get the message "Error establishing a database connection" on every page of my wordpress site. I cannot access wp-login.php either
I did back up the site a week ago (just by FTP downloading all files in the httpdocs folder).
I'm not a web expert; I have no idea what to do and this site is very important for our business.
I appreciate any help, thank you.