In case people get caught out by this, there is a new version of Mosquitto that has breaking changes.
You may well need to make some changes to your Mosquitto configuration file and restart in order to let Node-RED work correctly.
Co-incidentally I was just looking at this. This looks like a useful place to start. Migrating from 1.x to 2.0 | Eclipse Mosquitto
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I had to make these changes:
- Change my default listener from
port 1883tolistener 1883 - Include
allow_anonymous true
You might also need to change your binding.
It just caught me out because I did an sudo apt upgrade and then wondered why my lights didn't turn off at bedtime 
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Thanks for that Julian.
What OS is that Julian?
I've just done sudo apt update & sudo apt upgrade on a pi, rebooted and I've still got Mosquitto v1.5.7.
Did you update mosquitto separately?
Debian Buster.
However, I also have specific mosquitto apt sources:
deb https://repo.mosquitto.org/debian buster main
Which will doubtless be newer than the standard buster list. I have:
libmosquitto1:amd64 2.0.8-0mosquitto2~buster1
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Or on ubuntu
sudo add-apt-repository ppa:mosquitto-dev/mosquitto-ppa
The author publishes an "official" repo:
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