error in the sending data from azure iothub

Hello @gugulothu shiva

From the screenshot, the important part of the error is:

AuthenticationError('CBS Token authentication failed...')

This indicates that your Event Processor is reaching the IoT Hub built-in Event Hubs-compatible endpoint, but authentication to that endpoint is failing. I would troubleshoot the credentials/endpoint configuration first rather than AnyLogic itself.

For IoT Hub, make sure you're using the Event Hubs-compatible endpoint information, not the normal IoT Hub device connection string. IoT Hub exposes its built-in endpoint so that standard Event Hubs SDKs can consume device-to-cloud messages.

In the Azure portal, go to:

IoT Hub → Built-in endpoints → Events

Verify the following values against your application configuration:

• Event Hub-compatible name
• Event Hub-compatible endpoint
• Consumer group - you're currently using $Default
• Shared access policy/key being used by the consumer

Also make sure the SAS policy has Service Connect/Listen permission. Event consumers need authorization to receive events; incorrect SAS credentials or permissions can result in authentication failures.

One thing I'd specifically check in your code is the Event Hub name. A CBS Token authentication failed error can occur when the Event Hub name passed to the SDK is incorrect. Microsoft Q&A has documented cases where changing the value from a namespace/path to only the Event Hub name resolved this exact error.

For example, conceptually:

consumer = EventHubConsumerClient.from_connection_string(
    conn_str="<IoT Hub Event Hubs-compatible connection string>",
    consumer_group="$Default",
    eventhub_name="<Event Hub-compatible name>"
)

Don't use the IoT Hub name automatically as eventhub_name; use the Event Hub-compatible name shown under Built-in endpoints.

I would also check IoT Hub → Networking. If IP filtering is configured and Apply IP filters to the built-in endpoint is enabled, the machine/service running your consumer must originate from an allowed address. Microsoft notes that blocked access to the built-in endpoint can result in an unauthorized response.

If this still fails, please share the relevant connection code with the SharedAccessKey/SAS token removed, along with the Event Hub-compatible name and whether you're using SAS or Microsoft Entra authentication. That should help us identify exactly where the authentication mismatch is occurring.

Sharing these references with you:

Microsoft – Understand Azure IoT Hub endpoints

Microsoft – Event Hubs authentication troubleshooting

Microsoft – IoT Hub IP filtering

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