1. The wrong ports are being used to access the camera
Some cameras use alternate ports, or the user has configured traffic on their setup to only allow access for HTTP and RTSP on specific ports. Make sure these are the correct ports which have been set. Set this up in the camera properties under Alternate Ports.
2. Windows Firewall
Windows Firewall may be required to be disabled in order to get the camera stream. Please attempt to disable the firewall and try accessing the camera interface again.
3. Firmware Upgrade Needed
Camera manufacturers will update their firmware from time to time and this could be causing issues with the camera. The camera may need to be upgraded to the latest firmware revision to restore camera functionality. Check the manufacturer’s website for new firmware releases.
4. Not Enough Bandwidth
Megapixel cameras will consume bandwidth more than a 10/100 Mbps switch can handle. Please have these network considerations in mind when designing or upgrading the camera system. Cameras will cut in and out and may not ping correctly in this situation.
5. Insufficient PoE Power
If the PoE switch is overloaded, this may result in cameras being unresponsive to pings or cutting in and out with live video. Check the power load of the PoE switch, otherwise try to alleviate the stress of power being consumed.
6. VLAN Configuration
The inability to connect to a camera could be impeded by an improper VLAN setup which is filtering out Video traffic from reaching the VI Enterprise Server.
7. Internet Explorer settings need to be changed
Try adding the camera to Trusted Sites, Compatibility View Settings, and enabling ActiveX to download unsigned controls. It may be best to reset all IE settings and even delete temp files first, then proceed with the above mentioned.