Firewall between SAP application and database.

Hi,

1. I plan to install Biller Direct Java instance and MS SQL server database across the firewall. Would that be an issue? What ports should be open for installation?

2. The R3 back end is also in the same subnet as the Biller Direct database in.If I use HTTP SSL for connecting Biller Direct to R3, what ports should be open?

3. What's the port for Jco connection between Java instance and abap instance? I know for abap instance we need port 3300, but what port it is when data send back to Java instance from abap?

Thanks.