Offline - communication_error

First i I would like to apologize for my bad Englisch
I want connect a MQTT Broker to my openhab System but there is OFFLINE - COMMUNICATION_ERROR
instead of ONLINE i dont know what i should do
i will send the log file
I thank you in advance for a quick answer

==> /var/log/openhab2/events.log <==

2019-06-06 20:11:41.463 [hingStatusInfoChangedEvent] - ‘mqtt:broker:79851dda’ changed from OFFLINE (COMMUNICATION_ERROR): Verbindung zu Server kann nicht hergestellt werden to OFFLINE

==> /var/log/openhab2/openhab.log <==

2019-06-06 20:11:41.489 [INFO ] [.transport.mqtt.MqttBrokerConnection] - Starting MQTT broker connection to ‘localhost’ with clientid paho692462800957 and file store ‘/var/lib/openhab2/mqtt/localhost’

==> /var/log/openhab2/events.log <==

2019-06-06 20:11:41.517 [hingStatusInfoChangedEvent] - ‘mqtt:broker:79851dda’ changed from OFFLINE to OFFLINE (COMMUNICATION_ERROR): Verbindung zu Server kann nicht hergestellt werden

==> /var/log/openhab2/openhab.log <==

2019-06-06 20:11:51.093 [INFO ] [.reconnect.PeriodicReconnectStrategy] - Try to restore connection to ‘localhost’. Next attempt in 10000ms

2019-06-06 20:11:51.112 [INFO ] [.transport.mqtt.MqttBrokerConnection] - Starting MQTT broker connection to ‘localhost’ with clientid paho692416209293 and file store ‘/var/lib/openhab2/mqtt/localhost’

2019-06-06 20:11:51.492 [INFO ] [.reconnect.PeriodicReconnectStrategy] - Try to restore connection to ‘localhost’. Next attempt in 10000ms

==> /var/log/openhab2/events.log <==

2019-06-06 20:11:51.505 [hingStatusInfoChangedEvent] - ‘mqtt:broker:79851dda’ changed from OFFLINE (COMMUNICATION_ERROR): Verbindung zu Server kann nicht hergestellt werden to OFFLINE

==> /var/log/openhab2/openhab.log <==

2019-06-06 20:11:51.511 [INFO ] [.transport.mqtt.MqttBrokerConnection] - Starting MQTT broker connection to ‘localhost’ with clientid paho692462800957 and file store ‘/var/lib/openhab2/mqtt/localhost’

==> /var/log/openhab2/events.log <==

2019-06-06 20:11:51.554 [hingStatusInfoChangedEvent] - ‘mqtt:broker:79851dda’ changed from OFFLINE to OFFLINE (COMMUNICATION_ERROR): Verbindung zu Server kann nicht hergestellt werden

Hi Simon
Welcome to the OpenHAB community!
You might get help quicker by starting a new thread. Be sure to post your OpenHAB version and the platform you are running it on. Good luck!

Hey now with OpenHab 3 i have the same Error did you already found a solution ?