Getting Connection Closed on New Connection Error when it was previously not generated about azure-iot-sdk-csharp

[andyk-ms]

Confirming the version you used:
1.18.1 -> https://github.com/Azure/azure-iot-sdk-csharp/releases/tag/2018-10-9
1.42.0 -> https://github.com/Azure/azure-iot-sdk-csharp/releases/tag/2023-05-01
these are the versions in questions, correct?

In the log for 1.42.0, the error listed is AMQP but you seems to discuss a MQTT error. For the AMQP in the log, it indicates a retry-able error, do you have retry logic to handle this? Please elaborate on the error handling.
2024-04-16T02:03:39.7255428 [Microsoft-Azure-Devices-Device-Client-Enter] (RetryStrategyAdapter#31617841, RetryStrategyAdapter.ShouldRetry, (0, Microsoft.Azure.Devices.Client.Exceptions.IotHubCommunicationException: Exception of type 'Microsoft.Azure.Devices.Client.Exceptions.IotHubCommunicationException' was thrown.)).
_Type: AmqpException,
_Message: ,
_Source: '',
_HResult: [ -2146233088 ]

For the package, would you be able to update to the latest 1.42.3 with fixes to re-test?
https://github.com/Azure/azure-iot-sdk-csharp/releases/tag/2024-03-28

[ctruo]

Hi Andy. Thanks for your reply. Yes those are the versions.

We currently do not have retry logic to handle this. We only have a simple try-catch block. I can try to upgrade to 1.42.3 and test, but we do have some constraints when it comes to upgrades (sorry I cannot elaborate further). Ideally we would like to not have an upgrade, but if it is necessary we will see.

MQTT is only used when we connect using a connection string with DeviceId in it (HostName=xxxxx.azure.devices.net;DeviceId=xxxxx;SharedAccessKey=xxxxx). If we use a shared access level connection string with no DeviceId, AMQP is used so the logs you are seeing is that. We've changed the MQTT transport to AMQP for the time being.