D-Link DCS-933L User Manual page 45

Section 4 - Troubleshooting
The power supply might be faulty. Confirm that you are using the provided DC 5V power supply for this network camera. Verify that the power
supply is correctly connected. If the camera is functioning normally, the LED may have been disabled. See "Admin" on page 39 for information
about how to enable the LED.
4. Why is the camera's network connection unreliable?
There might be a problem with the network cable. To confirm that the cables are working, PING the address of a known device on the network. If
the cabling is OK and your network is reachable, you should receive a reply similar to the following (...bytes = 32 time = 2 ms).
Another possible problem may be that the network device such as a hub or switch utilized by the Network Camera is not functioning properly.
Please confirm the power for the devices are well connected and functioning properly.
5. Why does the Network Camera work locally but not remotely?
This might be caused by the firewall protection. Check the Internet firewall with your system administrator. The firewall may need to have some
settings changed in order for the Network Camera to be accessible outside your local LAN. For more information, please refer to the section about
installing your camera behind a router.
Make sure that the Network Camera isn't conflicting with any Web server you may have running on your network.
The default router setting might be a possible reason. Check that the configuration of the router settings allow the Network Camera to be accessed
outside your local LAN.
6. Why does a series of broad vertical white lines appear through out the image?
It could be that the image sensor has become overloaded when it has been exposed to bright light such as direct exposure to sunlight or halogen
lights. Reposition the camera into a more shaded area immediately, as prolonged exposure to bright lights will damage the sensor.
7. The camera is producing noisy images. How can I solve the problem?
The video images might be noisy if the camera is used in a very low light environment.
8. The images are poor quality, how can I improve the image quality?
D-Link DCS-933L User Manual 45