You may have found that push notifications to the HikVision IVMS-4500 App have stopped working if you have G1 series (aka EasyIP 3.0) cameras and have upgraded them to the latest V5.5.0 / 5.5.2 / 5.5.3 firmware.
HikVision introduced an additional security setting which you now need to adjust for use with the IVMS-4500 App (push notifications to the Hik-Connect App should remain fine with default settings).
Navigate to Configuration -> System -> Security
In the "WEB Authentication" field...
HikVision push notifications to IVMS-4500 App have stopped working on G1 cameras & latest firmware
HikVision introduced an additional security setting which you now need to adjust for use with the IVMS-4500 App (push notifications to the Hik-Connect App should remain fine with default settings).
Navigate to Configuration -> System -> Security
In the "WEB Authentication" field...
HikVision push notifications to IVMS-4500 App have stopped working on G1 cameras & latest firmware