Unable to connect azure eventhub emulator with Communication Exception: Connection refused: no further information

Hi @Bingqiang Xiang

Thank you for reaching out and providing detailed logs regarding your issue. The error you encountered, Connection refused: no further information, suggests that your application is unable to establish a connection to the Azure Event Hubs emulator.

Below are a few steps to help resolve the issue:

• Ensure that the Azure Event Hubs emulator is running and bound to localhost on the correct port.
• Check for any port conflicts or network restrictions that might block communication.
• Please confirm that your connection string is correctly formatted:

    Endpoint=sb://localhost;EntityPath=cpc-eh-aldp-forwarderdata-int-int01;SharedAccessKeyName=RootManageSharedAccessKey;SharedAccessKey=<Your_SAS_Key>;UseDevelopmentEmulator=true
  

  Replace <Your_SAS_Key> with the actual shared access key configured in the emulator.- Verify that no firewalls, proxies, or other network restrictions are interfering with localhost communication.
• Use a tool like netstat to confirm the emulator is listening on the expected port.
• To validate connectivity, you can use a simple script with the Azure Event Hubs SDK:

    from azure.eventhub import EventHubProducerClient
    connection_str = "Endpoint=sb://localhost;EntityPath=cpc-eh-aldp-forwarderdata-int-int01;SharedAccessKeyName=RootManageSharedAccessKey;SharedAccessKey=<Your_SAS_Key>;UseDevelopmentEmulator=true"
    try:
        client = EventHubProducerClient.from_connection_string(connection_str)
        with client:
            print("Connection successful!")
    except Exception as e:
        print(f"Connection failed: {e}")
  

• Ensure you are using the latest versions of the Azure Event Hubs emulator and the Azure Event Hubs SDK, as compatibility issues can sometimes cause such errors.

If the issue persists, could you please share the following additional details for further troubleshooting?

• Version of the Azure Event Hubs emulator you are using.
• Version of the Azure Event Hubs SDK in your application.
• Any other relevant configurations or logs.

I hope this helps! Let me know if you have any further questions.

@Bingqiang Xiang We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.

@Smaran Thoomu , thanks for your help. Actually, I used the SDK that is encapsulated by Azure Spark team. I think I should consult spark team for help.