Fixed broken links to samples

Author: kgremban

articles/iot-edge/how-to-authenticate-downstream-device.md

@@ -136,10 +136,10 @@ If you don't have a certificate authority to create X.509 certificates, you can
 5. Depending on your preferred language, review samples of how X.509 certificates can be referenced in IoT applications:
 
    * C#: [Set up X.509 security in your Azure IoT hub](../iot-hub/iot-hub-security-x509-get-started.md#authenticate-your-x509-device-with-the-x509-certificates)
-   * C: [iotedge_downstream_device_sample](https://github.com/Azure/azure-iot-sdk-c/tree/x509_edge_bugbash/iothub_client/samples/iotedge_downstream_device_sample)
+   * C: [iotedge_downstream_device_sample.c](https://github.com/Azure/azure-iot-sdk-c/tree/master/iothub_client/samples/iotedge_downstream_device_sample)
    * Node.js: [simple_sample_device_x509.js](https://github.com/Azure/azure-iot-sdk-node/blob/master/device/samples/simple_sample_device_x509.js)
-   * Java: [SendEventX509.java](https://github.com/Azure/azure-iot-sdk-python/blob/master/device/samples/iothub_client_sample_x509.py)
-   * Python: [send_message_x509.py](https://github.com/Azure/azure-iot-sdk-python/blob/master/azure-iot-device/samples/advanced-hub-scenarios/send_message_x509.py)
+   * Java: [SendEventX509.java](https://github.com/Azure/azure-iot-sdk-java/tree/master/device/iot-device-samples/send-event-x509)
+   * Python: [send_message_x509.py](https://github.com/Azure/azure-iot-sdk-python/blob/master/azure-iot-device/samples/async-hub-scenarios/send_message_x509.py)
 
 You can use the [IoT extension for Azure CLI](https://github.com/Azure/azure-iot-cli-extension) to complete the same device creation operation. The following example creates a new IoT device with X.509 CA signed authentication and assigns a parent device: