To use an AS/400 service, you must enable the Distributed Relational Database Architecture (DRDA) capability of the AS/400. The service communicates with the AS/400 through a TCP/IP connection to DB2 UDB.
To confirm that your AS/400 has DRDA capability:
Verify that you are using OS/400 V5R2 or higher.
Be sure that you define the local relational database using the add relational database directory entry ADDRDBDIRE command.
Enter this name on the worksheet for the appropriate platform as the Database Name. The Database Name is requested during installation and is the DatabaseName property in the service library configuration file called dcany.cfg, which is located in the ServerName\cfg subdirectory.
