I am actually trying to connect a WEB Server to a SAP system, which is behind a VPN, using the SAP jCO (java classes).
The address of the SAP system inside the client network is xxx.xxx.xxx.xxx and behind the VPN is yyy.yyy.yyy.yyy. I discovered that the jCO first makes connection on port 3600 to the address xxx.xxx.xxx.xxx and then the jCO switches and try to make a connection on port 3300 to the address yyy.yyy.yyy.yyy. Of course, as the address yyy.yyy.yyy.yyy isn't know on the client network, the second part of the call fails.
Is this something known ? Can we do something about it ?
Thanks for your help !