The white light parted ways with Lighttpd and started using mini_httpd instead, so the hack for Lighttpd no longer works.
However, the new hack is very similar.
1. SSH into the white light.
2. Use the modified ln command:
ln -s /shares/Public /proto/SxM_webui
3. Reboot (just in case, but you probably don't need it.)
4. now you can access the Public folder at