The server does not receive the data packet from the node or the device does not send the data packet? The device is set to ABP mode, have you changed the server to ABP mode?
Does the server not receive packets from the node or does the device not send packets? The device is set to ABP mode. Did you change it to ABP mode on the server?
Does the server fail to receive the packet from the node or does the device fail to send the packet? The device is set to ABP mode. Did you change it to ABP mode on the server?