On this page
01. Symptom02. Possible causes03. Safe checks you can do04. When to call a professional05. FAQ
If an NVR can't find or add an IP camera, the cause is usually power (no PoE), a bad cable or connector, an IP address problem, a password mismatch, or a compatibility setting. Work from the physical layer up: power and cable first, then network settings, then the recorder's add-device settings.
Key takeaways
- Check power first: is the camera's IR or LED on?
- Swap the cable or port to rule out cabling.
- IP address conflicts and wrong subnets are very common.
- A camera activated with a different password won't be added.
- Mixed brands may need ONVIF enabled.
01Symptom
The camera doesn't appear in the NVR's device list, shows as offline, or shows an error like "network unreachable" or "incorrect user name or password".
02Possible causes
| Cause | Typical sign |
|---|---|
| No PoE power | No IR glow at night, no link light |
| Bad cable or crimp | Link light flickers, camera drops in and out |
| Over 100 m cable run | Intermittent connection |
| PoE budget exceeded | Last cameras added won't power up |
| IP address conflict / wrong subnet | Camera visible to some devices but not the NVR |
| Password mismatch | "Incorrect user name or password" |
| Protocol / compatibility | Other-brand camera not found until ONVIF is enabled |
03Safe checks you can do
- 01Look for signs of powerAt night, is the camera's IR glowing? Is the port's link light on?
- 02Try a known-good portMove the camera's cable to a port where another camera works
- 03Reboot in orderRestart the switch/NVR, wait, then check again
- 04Check the NVR's device listIs the camera listed as offline, or missing entirely?
- 05Check for recent changesNew router, power surge, someone changed passwords?
04When to call a professional
- Several cameras dropped at once (often power, switch or surge damage)
- Cables need testing or re-terminating
- IP addressing and passwords need resetting
- The NVR needs a firmware update or configuration restore
Qyvea diagnoses and repairs recorders and cameras, including systems installed by other companies. See DVR/NVR repair and CCTV camera offline.
05Frequently asked questions
Why does my NVR say 'network unreachable'?
Usually the camera and NVR are on different subnets, the cable is faulty, or the camera has no power.
Can a Hikvision NVR record other brands?
Often, using the ONVIF protocol, but features may be limited. Check compatibility before buying.
Why won't my PoE switch power all cameras?
The switch has a total PoE power budget. Adding cameras beyond it leaves some unpowered.
