If you have 4 cameras streaming at 4K resolution with high bitrates, the NVR might run out of processing power and treat the next camera as "exceeding the limit."
If you are seeing this error on your PC while using the client: number of channels exceeded limit hikvision
Are you seeing this error on a monitor or through the iVMS-4200 computer software? If you have 4 cameras streaming at 4K
Go to Tool > System Configuration > Image and check the view settings. If you are managing hundreds of cameras, consider upgrading to HikCentral , which is designed for larger-scale enterprise limits. 5. Third-Party Camera Compatibility (ONVIF) consider upgrading to HikCentral