Fresh install of XAMPP and Livezilla, Livezilla creates the MySQL database as part of it's installation (if not already specified) which is what I have done. I have tried both 127.0.0.1 and localhost as the host but both give the same error.
Can't connect to database. Invalid host or login! (1045: Access denied for user 'root'@'localhost' (using password: YES))
Not too sure what the issue could be, my only assumption would be a permissions issue where Livezilla is being blocked from creating the DB for the Livezilla application.
In case you tried the wrong infos. The hostname and password you are trying to enter are the ones related to MySQL and not to Livezilla Server Admin application.