Unhandled errors when port-forwarding Kafka-UI

[marekberith]

Issue submitter TODO list

• I've looked up my issue in FAQ
• I've searched for an already existing issues here
• I've tried running main-labeled docker image and the issue still persists there
• I'm running a supported version of the application which is listed here

Describe the bug (actual behavior)

When running Kafka-UI behind a Kubernetes port-forward, I repeatedly see unhandled error messages in the logs. These errors appear whenever HTTP requests from Kafka-UI are cancelled or fail.

Actual behavior:

Handling connection for 8080
E0826 13:10:10.363900   58802 portforward.go:351] "Unhandled Error" err="error creating error stream for port 8080 -> 8080: Timeout occurred"
E0826 13:10:10.365456   58802 portforward.go:351] "Unhandled Error" err="error creating error stream for port 8080 -> 8080: Timeout occurred"
E0826 13:10:10.367811   58802 portforward.go:351] "Unhandled Error" err="error creating error stream for port 8080 -> 8080: Timeout occurred"

Kafka-UI version: v1.3.0

Expected behavior

No crashes of port-forward expected

Your installation details

Kubernetes, installed Kafka UI with Helm Chart, chart version 1.5.1, Kafka UI version v1.3.0

Steps to reproduce

1. Deploy Kafka-UI in Kubernetes.
2. Run: kubectl port-forward svc/kafka-ui 8080:80
3. Access Kafka-UI at http://localhost:8080.
4. Open some topic and while it is loading messages, try to search some string

Screenshots

No response

Logs

No response

Additional context

No response

[github-actions]

Hi marekberith! 👋

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[Haarolean]

Works for me:

$  kubectl port-forward kafka-ui-main-5b6b6bdf6-5hqxn 8081:8080 -n kafka-ui
Forwarding from 127.0.0.1:8081 -> 8080
Forwarding from [::1]:8081 -> 8080
Handling connection for 8081
Handling connection for 8081
Handling connection for 8081
Handling connection for 8081

I don't know how to help you here anyway as it's an issue with your infra, not the app itself.

[kapybro]

Further user feedback is requested. Please reply within 7 days or we might close the issue.

[marekberith]

Am I missing some configuration, @Haarolean? When I try to read messages from the topic, the request is sent with a query parameter that has an empty value - you can see it in the video. This causes the request to fail, and I also get an error message in the port-forward logs.

Recording.2025-08-27.080054.mp4

[kapybro]

Thanks for the additional feedback! We'll get back to your issue soon.

[Haarolean]

You should've started with that, not a port forwarding question.

Please try main-tagged image as suggested in the issue template first, if you still can reproduce it, share the request that fails including params, response body and code, and container logs.