After a factory reset you will need to re-register mydlink account for your camera.
Do not unplug the power during this procedure.
Place a paperclip into the reset pinhole located on the back of DCS-2670L.
Press and hold the RESET button for 10 seconds while DCS-2670L is powered on. The LED will turn RED or go off and come back on. The camera will then reboot and be at factory defaults.
Then the unit will reboot. Once the LED light in the front of the unit stops blinking, the unit is reset and all settings are restored to their defaults.