Domain Mapping issue using Domain Mapping plugin with PRo Sites

Domain mapping issue:

Have moved the sunrise.php file
ave edited the wp-config.php to include
'define( 'SUNRISE', 'on' );' it didnt work. have since commented out

define('DOMAIN_CURRENT_SITE', 'website-4-small-businesses.com');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

still not working, going to any mapped domian is taking the visitor to the wp-signup.php

We are on nginx using aws ec2 instance.