Cannot connect to AWS IoT service, MqttException - javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown

_x000D_ _x000D_ I am trying to establish a connection between my device and the AWS IoT service using TLS 1.2 authentication via MQTT Client. As per the AWS IoT documentation, I stored the RootCA certificate inside JAVA_Home/jre/Lib/Security/CACerts in a keystore. I was able to generate the certificate and keys for the device to be used to connect to AWS IoT service using CreateKeysAndCertificateResult. Later, I created X.509 certificate from PEM string and the RsaCrtKeySpec object from the private key string in the keypair object. I saved this in a keystore and used the keystore in the MQTT Client object to connect to AWS IoT. However, the connect() throws an exception listed below. Any help on this will be appreciated. Aug 11, 2017 10:49:18 AM com.amazonaws.services.iot.client.mqtt.AwsIotMqttConnectionListener onFailure WARNING: Connect request failure MqttException (0) - javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown