MQTT on HomeAssistant PI report Error : disconnect from server

Three PI installations of MQTT in my network allow the MQTT service. The MQTT on the Home Assistant PI reports directly despite the correct data and IP address: Disconnect from server
does anyone have any idea why this is the case?

regards Hans

Drei PI MQTT Installationen in meinem Netzwerk lassen den MQTT Dienst zu. Das MQTT auf dem Home Assistant PI direkt meldet trotz richtiger Daten und IP Adresse : Disconnect from server
hat jemand eine erste Idee warum das so ist ?

regards Hans

Hi,
If you mean:

2024-07-01 18:42:14: New connection from 172.30.32.2:43522 on port 1883.
2024-07-01 18:42:14: Client <unknown> closed its connection.
2024-07-01 18:44:14: New connection from 172.30.32.2:56942 on port 1883.
2024-07-01 18:44:14: Client <unknown> closed its connection.

The answer is:

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