本地连接Kafka提示连接被拒绝，报错信息如下。

:30:34.701 [main] DEBUG org.apache.kafka.clients.producer.KafkaProducer - Exception occurred during message send:
org.apache.kafka.common.errors.TimeoutException: Failed to update metadata after 60000 ms.
13:30:35.480 [kafka-producer-network-thread | producer-1] DEBUG org.apache.kafka.common.network.Selector - Connection with /47.95.236.75 disconnected
java.net.ConnectException: Connection refused: no further information
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
    at org.apache.kafka.common.network.PlaintextTransportLayer.finishConnect(PlaintextTransportLayer.java:51)
    at org.apache.kafka.common.network.KafkaChannel.finishConnect(KafkaChannel.java:73)
    at org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:323)
    at org.apache.kafka.common.network.Selector.poll(Selector.java:291)
    at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:260)
    at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:236)
    at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:135)
    at java.lang.Thread.run(Thread.java:748)

去服务器，修改config/server.properties配置文件，更改如下
把31行的注释去掉，listeners=PLAINTEXT://:9092
把36行的注释去掉，把advertised.listeners值改为PLAINTEXT://host_ip:9092（我的服务器ip是47.75.236.75）