Communication problem with Industrial relay controller

we bought an industriale solid state relay controller equipped with an ethernet to serial communications module (model NCD5500). When i plug the ethernet cable from my computer to the ncd 5500 board, i see both the green and amber light (the last one is flashing). The device is found when i use the config tool software or in the Select Connection windows that first appears when i run the Alpha Base Software. The ip address of the device is and the port is 2101. However the Alpha Base software is unable to communicate with the device. Furthermore when i try to ping the ip address i have the following message : Ping transmit failed. General Failure.
I try to desactivate Windows Firewall without success.
Any advices ?