D-Link DCS-5211L User Manual page 62

Section 5 - Security
Repeat the above steps adding the port 554 to both the Public and Private Port sections. A check mark appearing before the entry name
will indicate that the ports are enabled.
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 user manual for specific instructions
on how to open ports.
Enter valid ports in the Virtual Server section of your router. Please make sure to check the box next to the camera name on the Virtual
Server List to enable your settings.
D-Link DCS-5211L/DCS-5222L User Manual 58