We were setting up the opal server (Datashiled 5) in our institute for data sharing. For security issue, the ports of the machine were only exposed for the use of opal server, and rest ports must be closed. Can I know what is minimum set of exposed ports that the opal need ? To my knowledge, only 8080 is used for connection (between server and client) during the analysis. So should we only keep 8080 open?