D-Link DCS-934L User Manual page 54

Section 4 - Configuration
Important: Some ISPs block access to port 80 and other commonly used Internet ports to conserve bandwidth. Check with your ISP so that you
can open the appropriate ports accordingly. If your ISP does not pass traffic on port 80, you will need to change the port the camera uses from 80
to something else, such as 800. Not all routers are the same, so refer to your router's user manual for specific instructions on how to open ports.
Enter valid ports in the Virtual Server list for your router. Make sure you check the box next to the camera name on the Virtual Server List to enable
your settings.
D-Link DCS-934L User Manual 54