Please HELP! cannot start http://localhost:50000 (WAS 6.30 Sneak Preview)

Hello,

I'm evaluating SAP NetWeaver Developer Studio (Sneak Preview).

I deploy & run correctly the "Welcome" app as described in the tutorial, and all SAPMMC instances are up (green).

But I cannot start http://localhost:50000, neither /admin or any Webdynpro app (for instance the Flights app tutorial, or a custom SalesOrder using BAPI_SALESORDER_CREATEFROMDAT2 RFC Import): my web browser returns me a 404 Error (Not Found - The requested resource does not exist)..

Can someone tell me why??

Thanks a lot in advance & regards

Gianluca