Dennis I don't think I ma using ODBC as nothing is configured from ODBC perpective. The VB application is .msi compiled with Oracle libraries on the development side and I had executed the msi executable to install the application on all QA workstation. I will check with Development as if the VB application is compile with Oracle 10g or any other version which may be giving this issue. As I found that PC where it is working has Oracle 8i/9i/10g client installed. Tx Sanjay Dennis Williams <oracledba.williams@xxxxxxxxx> wrote: Sanjay, I'm no VB expert, just a DBA that has had to deal with VB developers. Usually, I say that if SQL*Plus works correctly, then SQL*Net is correctly configured so the problem must be in VB or the Microsoft configuration. All the things you mention that you tried simply confirm that SQL*Net is correctly configured. You say that one of the PC's works correctly. I would try to find out what is different about the VB configuration on that PC vs. the other two. I think that will likely correct the problem. Unfortunately, I can't tell you what to check on the Microsoft side. Are you using ODBC? Dennis Williams --------------------------------- Ready for the edge of your seat? Check out tonight's top picks on Yahoo! TV.