Fist thing is check if your MQTT server is running, and that websockets is enabled. If your running Mosquito on say Debian check etc/mosquitto/mosquitto.conf Verify websockets is enabled on port 9001. One possibility as to why it suddenly stopped working, I believe Debian had a recent update to MQTT server, if you updated it should have prompted you to keep your current configuration file or replace it with the new release version. If you didn't choose to keep your config, by default web sockets is disabled. Obviously if it's disabled just edit the config file, enable it and restart MQTT.
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