http://www.gdbasedomain.com/multisitefolder/
is ... weird.
You said you installed it at gdbasedomain.com so why is multisite folder there?
What's in your .htaccess and what's in the Multisite section of your wp-config?
http://www.gdbasedomain.com/multisitefolder/
is ... weird.
You said you installed it at gdbasedomain.com so why is multisite folder there?
What's in your .htaccess and what's in the Multisite section of your wp-config?