Not able to connect to bootstrap server

[abhishekray323]

Hi,
I am new at kafka-ui. I am trying to create a cluster. I have zookeeper at port 2181 and kafka at 9092 already running. I am trying to connect the cluster to broker at my local machine ( on port 9092 ), but when I validate before creating cluster, it is failing and I am getting these logs in console

2025-01-10 09:58:49,407 INFO [kafka-admin-client-thread | kui-admin-client-validation-1736503129294] o.a.k.c.NetworkClient: [AdminClient clientId=kui-admin-client-validation-1736503129294] Node -1 disconnected.
2025-01-10 09:58:49,412 WARN [kafka-admin-client-thread | kui-admin-client-validation-1736503129294] o.a.k.c.NetworkClient: [AdminClient clientId=kui-admin-client-validation-1736503129294] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available.

Can somebody help me understand what I am doing wrong

[Haarolean]

if you're running as a container, localhost host would be container's host, not your baremetal machine's. That's how docker networking works.

Some old thread about this: provectus/kafka-ui#1081
You can find different ways to connect to your baremetal host online, this might depend on environment, docker version, OS, etc.

[abhishekray323]

Thanks , the solution in article solves my issue too
Looking into how networking works in docker.
:)