In some cases, the deployment in the Web Console fails with status code 400: Unable to process JSON.
Hardware Models
Oracle Database Appliance X7-2S, X7-2M, and X7-2-HA
Oracle Database Appliance X6-2S, X6-2M, and X6-2L
Workaround
Restart the dcs-agent, then open a new browser session to the Web Console to finish creating (deploying) the appliance.
cd /opt/oracle/dcs/bin initctl stop initdcsagent initctl start initdcsagent