Problem connecting to postmaster

Hi,

I have installed native postgresql8.0.1 on a PC running Windows XP
professional.
I am having trouble connecting to it from my application.  The application
is a combination of java and C++ which was developed on Sun Solaris (Unix).
Thus on the PC, I have installed Microsoft Interix (Service For Unix) on
the PC to run the application.  I don't know if this is the problem or not,
but I am thus trying to connect to the DB running native from an application
running from Interix.  Does anyone know if this is inherently a problem?

My java code connects to the DB using
 DriverManager.getConnection("jdbc:postgresql://gandalf:5432/mydb",
user, passwd);

I get a PSQLException with a null message when this is executed.

I start up the postmaster with -i to allow TCP/IP connections.
I set Windows Firewall to "off"

Does anyone have any experience using Interix (SFU) connecting to the DB?

Any suggestions?

Thanks,
Glenn