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=The widget gives an "Invalid username or password" notice/ I have a private configuration of YOURLS (admin access needs password).=

This happens because your YOURLS installation is private configuration. To fix this you have to edit the yourls-widget-config.php and add user and password in the fields.

Example with username "user and password "password: becomes:

=Let any website use my API even if I have password protected admin=

To do this you have to edit your YOURLS API (yourls-api.php) and remove these lines:

if ( defined(ÕYOURLS_PRIVATEÕ) && YOURLS_PRIVATE == true )
require_once( dirname(__FILE__).Õ/includes/auth.phpÕ );

This will disable the password protection on the API, but will keep your admin menu passworded.