Frigate won’t start [Errno 111] Connection refused

I updated my Debian server and noticed that Frigate won’t start up. My Frigate NVR is running on a Docker container and checking the logs I found that predominantly the error [Errno 111] Connection refused popped up.

I also received an error about unable to connect to MQTT and then realised that I need to check MQTT.

I am using Home Assistant as my MQTT broker and found that after updating Home Assistant the MQTT service did not start and was set to not start at boot.

I managed to run and connect to Frigate after the MQTT service on Home Assistant was started and set to start at boot.