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braahhh! openHAB won’t connect to mosquitto:

2017-07-20 22:57:33.677 [INFO ] [t.mqtt.internal.MqttBrokerConnection] - Starting MQTT broker connection 'mqttson'
2017-07-20 22:57:35.679 [ERROR] [t.mqtt.internal.MqttBrokerConnection] - MQTT connection to broker was lost
Connection lost (32109) - java.io.EOFException
	at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:146)[197:org.openhab.io.transport.mqtt:1.10.0]
	at java.lang.Thread.run(Thread.java:745)[:1.8.0_121]
Caused by: java.io.EOFException
	at java.io.DataInputStream.readByte(DataInputStream.java:267)[:1.8.0_121]
	at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:65)[197:org.openhab.io.transport.mqtt:1.10.0]
	at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:107)[197:org.openhab.io.transport.mqtt:1.10.0]
	... 1 more
2017-07-20 22:57:35.682 [ERROR] [t.mqtt.internal.MqttBrokerConnection] - MQTT connection to 'mqttson' was lost: Connection lost : ReasonCode 32109 : Cause : null
2017-07-20 22:57:35.683 [INFO ] [t.mqtt.internal.MqttBrokerConnection] - Starting connection helper to periodically try restore connection to broker 'mqttson'

mqtt.cfg:

mqttson.url=tcp://localhost:1883
mqttson.clientId=OH2MQTT

installed mosquitto via openhabian-conf
and “systemctl status mosquitto” says it’s running.

are there more settings?

i already tried to delete the mqtt binding config via karafe console but the error remains :frowning:
what am i missing (again)…?