we have the same issue since 31/03/2025. IoT Devices cannot call our API but postman succeeded.

We are using a Quectel module with 4G network. The module responds "socket closed" when we try to call the api.

I have opened a ticket here : https://learn.microsoft.com/fr-fr/answers/questions/2243648/iot-device-fails-to-connect-to-azure-app-service-a?comment=question&translated=false