This happens when the link between AtSite and WebEye the cloud portal was broken. Alternatively, there was some problem with the internet such as being super slow, or not a secure link.
The solution is to check your internet. Is it working well? If using WiFi, does the connection need you to login first (this is a common cause)?
Try hot spotting your phone to AtSite. Does that help (if it does, the WiFi or internet you had been using is the caue).