Which TLS version does Azure IoT SDK v1.4.3 support?

Camilla Lie 26

We are using Azure IoT SDK version 1.4.3 and are wondering how we can find documentation on which TLS version this SDK supports?

From this link: https://build5nines.com/azure-iot-hub-and-dps-to-only-support-tls-1-2-on-july-1-2020/ , it appears that after July 1st 2020, IoT Hub no longer supports TLS version lower than 1.2, meaning we need to make sure our SDK also supports this version.

Thank you!

Elhorton-MSFT 116 Reputation points

2020-06-23T16:11:18.633+00:00

Hi @CamillaLie-1913 , thanks for the question! Which SDK are you using (i.e. C, Python, Java, etc.)?
Camilla Lie 26 Reputation points

2020-06-24T07:30:36.9+00:00

We are using Python 1.4.3 :)
QuantumCache 20,346 Reputation points

2020-06-26T20:48:20.997+00:00

Hello @Camilla Lie , Just checking back, could you please let us know if you need further help in this matter.
Camilla Lie 26 Reputation points

2020-06-30T08:54:26.027+00:00

Thanks, I got the answer that I needed :)

Accepted answer

Leon Laude 85,841 Reputation points

2020-06-24T10:17:35.987+00:00

Hi,

You'll find the supported TLS versions here:

TLS support in IoT Hub
https://learn.microsoft.com/en-us/azure/iot-hub/iot-hub-tls-support

Microsoft is deprecating TLS 1.0 and TLS 1.1 in IoT Hub, however they will continue to support it still until further notice.

Deprecation of TLS 1.0 and 1.1 in IoT Hub
https://learn.microsoft.com/en-us/azure/iot-hub/iot-hub-tls-deprecating-1-0-and-1-1

Best regards,
Leon
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Camilla Lie 26 Reputation points

2020-06-24T11:18:38.94+00:00

Thank you for the links, I have already seen through them. It appears that to set a minimum TLS version, this has to be done when the IoT hub is created. So there is no way of doing this to an existing IoT Hub?

Also, do you know where we can find which TLS versions each version of the IoT SDK supports?

Leon Laude 85,841 Reputation points

2020-06-24T11:44:49.473+00:00

Most SDKs support both TLS 1.0 and 1.1, the Python SDK does not support TLS 1.1 connections due to security concerns.
If you're using the versions mentioned in the list in the link below or newer version you will also gain support for TLS 1.2.

https://learn.microsoft.com/en-us/azure/iot-hub/iot-hub-tls-support#use-tls-12-in-your-iot-hub-sdks

When using the Azure IoT SDK in your application, you can control which version of TLS is being used, however I'm not sure how it's done with Python.
Every SDK page, except for Python has a guide on how to configure the TLS.
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