Cups is always asking for password when printing on a certain printer

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http://askubuntu.com – When I send print to a network printer (HP Laserjet 2200d), CUPS asks for username/password. It doesn't happen with other printers and I'm sure its a CUPS issue, because it's asking the password even if I'm not connected to the network. Here is my /etc/cups/cupsd.conf: # # # Sample configuration file for the CUPS scheduler. See "man cupsd.conf" for a # complete description of this file. # # Log general information in error_log - change "warn" to "debug" # for troubleshooting... LogLevel warn # Deactivate CUPS' internal logrotating, as we provide a better one, especially # LogLevel debug2 (HowTos)