Cipher Suites Supported by CDO's Secure Device Connector
CDO's Secure Device Connector uses node.js which only accepts the latest and most secure ciphers. As a result, CDO's SDC only supports this list of ciphers:
ECDHE-RSA-AES128-GCM-SHA256
ECDHE-ECDSA-AES128-GCM-SHA256
ECDHE-RSA-AES256-GCM-SHA384
ECDHE-ECDSA-AES256-GCM-SHA384
DHE-RSA-AES128-GCM-SHA256
ECDHE-RSA-AES128-SHA256
DHE-RSA-AES128-SHA256
ECDHE-RSA-AES256-SHA384
DHE-RSA-AES256-SHA384
ECDHE-RSA-AES256-SHA256
DHE-RSA-AES256-SHA256
If the cipher suite you use on your ASA is not in this list, SDC does not support it and you will need to update the cipher suite on your ASA.