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Since around yesterday, our Azure IoT Hub has started refusing connections from our IoT devices. Based on the logs in Application Insights, the connections are being refused because the devices are using the TLS cipher TLS_RSA_WITH_AES_256_CBC_SHA256, which is apparently no longer allowed. This came as a surprise, as we did not receive any warning that this specific TLS cipher would be rejected.
We already have a patch ready for our devices that changes the TLS cipher, and we have successfully tested it on a few devices that are now able to connect.
How can we disable “strong cipher suites”-enforcement temporarily so that our devices can reconnect and receive the update? Updating all devices manually would not be feasible.
An Azure service that enables bidirectional communication between internet of things (IoT) devices and applications.
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Hi Jesper
We are facing a similar issue with our device fleet and are also waitng on a similar solution from MS.
Regards
Denis.
Yes this is very similar. As the solution for both our problems would be to temporarily be allowed to use less secure version of TLS(in my case still 1.2 but with other cipher) to be able to update our devices to the one of strong ciphers that are allowed.