Is there a dependency of DOA 4.0.3 on Oracle 9 client? I have been using an exe built in Delphi 7 using DOA 4.0.3 in Windows Server 2008 with Oracle 9 client. When I tried to run the same exe on a different Windows Server 2008/2012 server, but with Oracle client 11g, it is not able to make connection. DB is tested from the new server and also the TNSNames verified.

Can you please provide your comments.