D-Link DCS-3420 - Wireless Day And Night Internet Camera Network User Manual page 127

Section 4 - Security
The Advanced > Network page displays the port settings for your camera. If necessary, these ports can be changed if
they are already in use by other devices (e.g. in a multiple camera environment).
Note: HTTP port, UDP Audio Channel port and UDP Video
channel port needs to be opened for the DCS-3420. Please
refer to page 129 for instruction.
D-Link DCS-340 User Manual 1