For registration you've Joomlas turned off. You need to ensure CBs is turned on within CB > Configuration > Registration by setting "Allow User Registration" to 'Yes, Independent of CMS "allow registration"'. Check that CB Core within CB > Plugin Management is published and public access. Next in Extensions > Plugins ensure "Authentication - Joomla" is published and public. Alternative is you're forcing HTTPS for login, but are trying to login from HTTP. Edit your CB login module within Extensions > Modules and under "Login and Logout Options" set "Encrypt Login Form" to "No".