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Faced a problem with the mqtt protocol. I can't connect to the mqtt broker, I get MqttException in the logs (see screenshot 1, 2). Although a year ago everything worked fine ... enter image description here enter image description here

The broker is installed on a mini pc that is connected to the router via Wifi. The mini pc pinged and I can log into it with TeamViewer. I downloaded and installed Mosquitto Mqtt on my personal laptop, entered the login, password, broker's ip and port 1883 (see screenshot 3). But Mosquitto Mqtt does not connect to the broker. enter image description here

I checked the login and password, tried to restart, reinstall the broker. Tried other ports 443, 8883, 80. No result.

In the Firewall (on a mini PC and on my laptop), I registered the rules for port 1883 (see screenshot 4-7). Tried to turn off Firewalls everywhere. enter image description here enter image description here enter image description here enter image description here

I also registered ports on the router (see screenshot 8). enter image description here

Using the netstat-an command, I checked port 1883, it seems to be working (see screenshot 9). The broker itself is also visible in the task manager processes. enter image description here

But telnet on the mini pc could not reach port 1883 (see screenshot 10). enter image description here

I don't know what else to try and how to solve it. Tell help.

Alex20280
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