I'm running slackware 13.37 on an HP pavillion g series. I'm trying to add a printer. I run "Manage Printers" which opens up http://localhost:631/ in my browser. I press the 'Add Printer" button and get a pop-up window titled, "Authentication Required", with the text, "A username and password are being requested by http://localhost:631. The site says: 'CUPS' " over two fields labeled 'User Name' and 'Password'.
Neither my username and password nor root's username and password are accepted. Does anyone know what is going on here and how I can get CUPS to recognize valid username-password pairs?