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network-programmingmqttiotmosquitto

Mosquitto: Starting in local only mode

I have a virtual machine that is supposed to be the host, which can receive and send data. The first picture is the error that I'm getting on my main machine (from which I'm trying to send data from). The second picture is the mosquitto log on my virtual machine. Also I'm using the default config, which as far as I know can't cause these problems, at least from what I have seen from other examples. I have very little understanding on how all of this works, so any help is appreciated.

What I have tried on the host machine:

  1. Disabling Windows defender
  2. Adding firewall rules for "mosquitto.exe"
  3. Installing mosquitto on a linux machine

First error

Second error

Netstat info

Solution

  • Starting with the release of Mosquitto version 2.0.0 (you are running v2.0.2) the default config will only bind to localhost as a move to a more secure default posture.

    If you want to be able to access the broker from other machines you will need to explicitly edit the config files to either add a new listener that binds to the external IP address (or 0.0.0.0) or add a bind entry for the default listener.

    By default it will also only allow anonymous connections (without username/password) from localhost, to allow anonymous from remote add:

    allow_anonymous true
listener 1883

    More details can be found in the 2.0 release notes here