The hidden button in the pinhole beside the Ethernet socket is used to reset the system or restore the factory default settings. Sometimes resetting the D-Link DCS-6111 will return the system back to a normal state. If the system still has problems after reset, restore the factory settings and install again:
RESET:
Step 1: Lightly insert a paper clip (or a similar sized tool) into the reset hole on the back of the D-Link camera, press lightly and then release the button.
Step 2:The LED on the front of the camera will begin blinking red and green.
Step 3:When the LED stops the blinking the reset has completed.
RESTORE:
Step 1:Insert the paperclip or other tool and hold the button in.
Step 2:Wait for the LED on the front of the camera to blink red and green
and hold the button for 30 seconds.
Step 3:Withdraw the tool after the second cycle of the LED blinking and
a factory restore has been completed.