Hello,
I don't know your model, but the DCS-2000 works with this URL:
Camera Model: D-Link DCS-2000 & DCS-2100+
Possible URL:
http://<IP address>/cgi-bin/video.jpg
Are you sure, that Camuniversal is not blocked by a firewall?
Are you using the latest CamUniversal version?
Have you selected in CamUniversal the correct mode (still picture, mjpeg)?