To find out what the reason is causing the camera to be shown offline, try following this checklist:
Reboot the camera. The easiest thing for you is to be sure that it isn't stuck.
Make sure that the camera is working. Try connecting to its local web admin interface, for example, check its status LEDs or mobile app connection.
Cameras connected via port-forwarding
Anything in your network setup has been changed:
Check if your public IP address or dynamic DNS name is still the same
Consider either asking your ISP for a static IP address using some DDNS service or using our AngelBox to overcome this once and for all.
Check that the local IP address of the camera is still the same. If you reboot your router or if your camera is offline for a day or more, its IP address can change. In that case, update this IP address in your port forwarding rule in your router.
To fix this completely, consider binding the MAC to the address of your camera to a single local IP address.
Check your network and port-forwarding settings in the router. Be sure that the camera has access to your router and especially that your current router port forwarding rule is correct. You can again use this guide to make sure you didn't miss anything.
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