PL/SQL External Procedure

I'm new to pl/sql so I could use some advice to the following problem:

I've created an external procedure to be accessed from an api. I've enabled the listener, placed the dll on the server,  created the library pointing to the dll and finally the pl/sql function  within the package.
The package calls a C function that in turn calls a C++ function. The call to the C++ function works fine in that it passes and returns  arguments ok, its just that when I try to create a (MFC) ODBC database  connection I get the following error ( when testing from Oracle Sql Worksheet ):

    ORA-28576: lost RPC connection to external procedure agent

Any help would be appreciated !

Thanks very much in advance,
John Alden ( dazed and confused ) Received on Wed Sep 23 1998 - 00:00:00 CDT