Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available

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1

I’m running the confluent platform in wsl 2(Ubuntu Distribution) and I also running a Spring application on Windows but when I send a message with a producer I have this error:

Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. Bootstrap broker localhost:9092 (id: -1 rack: null) disconnected

I have a look this articles:

and

and

but I don’t find the solution.

How is the configuration in confluent/etc/kafka/server.properties file?

I set this configuration:

advertised.listeners=PLAINTEXT://127.0.0.1:9092
listener.security.protocol.map=PLAINTEXT:PLAINTEXT
listeners=PLAINTEXT://0.0.0.0:9092

But It doesn’t work my spring boot application on Windows…

With this command I can see all is ok:
confluent local services status

Kafka is running on: “localhost:9092” and within WSL2 I can send (producer) and read messages (consumer) correctly but it doesn’t work my spring boot application on Windows.

Could you please advice how to solve this error?
Thanks in advance!

3

With the command

ip addr | grep eth0

on Ubuntu terminal I can get external interface IP, I set this IP on advertised.listener and with the command

netsh interface portproxy add v4tov4 listenport=9092 listenaddress=0.0.0.0 connectport=9092 connectaddress=XXX.XX.XX.XX

being XXX.XX.XX.XX the external interface IP and put this command on Windows cmd I can forward ports.

With the command netstat -ab I can see on Windows cmd the IP and Port TCP 0.0.0.0:9092. It works correctly!

4

@davidleongz glad you got it fixed, and thanks for taking the time to share the solution :+1:

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