Close access to the one folder using Nginx
server {
#...
location ^~ /path/to/folder/ {
deny all;
}
#...
}
Close access to several folders using Nginx
server {
#...
location ~* ^/(folder_1|folder_2)($|\/) {
deny all;
}
#...
}
After making changes do not forget to restart the Nginx:
service nginx reload
or
service nginx restart