GitHub user dosubot[bot] added a comment to the discussion: Error export a PDF in the GUI
<!-- Answer --> The `ConnectionRefusedError` you're encountering typically indicates that Celery is unable to connect to the broker, which in your case is likely Redis. Here are some steps to troubleshoot and resolve this issue: 1. **Verify Redis is Running**: Ensure that your Redis server is up and running. You can check this by using the `redis-cli ping` command, which should return `PONG`. 2. **Check Broker URL**: Confirm that the broker URL in your Celery configuration matches the Redis server's address and port. The default broker URL in Superset is `redis://localhost:6379/0` <sup>[[1]](https://github.com/apache/superset/blob/master/superset/config.py)</sup>. Make sure this is correct and that Redis is accessible at this address. 3. **Firewall and Network**: Ensure there are no firewall rules or network issues preventing Celery from connecting to Redis. If Redis is running on a different host, verify that the host is reachable and the port is open. 4. **Redis Logs**: Check the Redis logs for any errors or warnings that might indicate why the connection is being refused. 5. **Celery Configuration**: Double-check your Celery configuration to ensure it's correctly set up to use Redis as the broker. The configuration should look something like this: ```python broker_url = 'redis://localhost:6379/0' ``` 6. **Restart Services**: Sometimes, simply restarting the Redis server and Celery workers can resolve transient connection issues. By following these steps, you should be able to identify and fix the connection issue between Celery and Redis. <!-- Dosu Comment Footer --> *To continue talking to [Dosu](https://dosu.dev), mention @dosu.* --- <sup>Help Dosu learn! Give it feedback: [Great Response](https://app.dosu.dev/response-feedback/f1cbbc02-2840-4047-a3cd-ea5e274df008?feedback_type=great_response) | [Irrelevant Answer](https://app.dosu.dev/response-feedback/f1cbbc02-2840-4047-a3cd-ea5e274df008?feedback_type=irrelevant_answer) | [Incorrect Sources](https://app.dosu.dev/response-feedback/f1cbbc02-2840-4047-a3cd-ea5e274df008?feedback_type=incorrect_sources) | [Too Verbose](https://app.dosu.dev/response-feedback/f1cbbc02-2840-4047-a3cd-ea5e274df008?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/f1cbbc02-2840-4047-a3cd-ea5e274df008?feedback_type=hallucination) | [Bug Report](https://app.dosu.dev/response-feedback/f1cbbc02-2840-4047-a3cd-ea5e274df008?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/f1cbbc02-2840-4047-a3cd-ea5e274df008?feedback_type=other)</sup> GitHub link: https://github.com/apache/superset/discussions/32918#discussioncomment-12679379 ---- This is an automatically sent email for notifications@superset.apache.org. To unsubscribe, please send an email to: notifications-unsubscr...@superset.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: notifications-unsubscr...@superset.apache.org For additional commands, e-mail: notifications-h...@superset.apache.org
