use show version command and scroll to license output. to connect with HTTPS and secured manner, device needs 3DES-AES license. Are you planing to install cisco ASA firewall which have no configuration at all? to enable access to the firewall through the ASDM you can carry below steps initially, (guess there is nothing in the ASA configuration )ġ – Connect to Firewall through console to your PCĢ – check the license for 3DES-AES encryption.