OpenALPR - Error on receive image from entity: Can't connect to

I’m having the following error when using OpenALPR with ffmpeg camera. When i open this address with browser, it works.

2018-02-15 23:20:10 WARNING (MainThread) [homeassistant.helpers.entity] Update of image_processing.openalpr_frente is taking over 10 seconds
2018-02-15 23:20:10 ERROR (MainThread) [homeassistant.components.image_processing] Error on receive image from entity: Can’t connect to https://xxx.duckdns.org:8123/api/camera_proxy/camera.frente?token=239a22c020d99....2491c3737