Check these out. It looks like there are a couple of issues with this cam.

Can I modify DCS-5300 standard homepage layout? - dslreports.com

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You don't need your PC at all, except maybe to configure them, these have a built in web server. You need to configure your IP's and ports in the camera and also your router. You'll need to make sure there are no conflicting IPs' on your network and you may have to open or forward the ports in the router that each camera is set up at.