While testing we are again facing some issues with the CAN communication. Earlier it was working properly. ISSUE : Rugged board is able to receive CAN but not able to transmit anything… not even the ACK for an incoming frame. We are testing with an external CAN device and when we are transmitting a frame from outside while viewing the Candump, we see that the Frame is received in rugged board and we can view it in the CAN dump but rugged board is not sending any ACK. Since the ACK is not received the external CAN HW repeatedly keeps sending the frame at a high rate. Our Rugged board is booting from SD Card.