CODBC - Cannot establish a connection

I am trying to establish a DSN connection to a Navision 3.7A database which resides on a server.

I can successfully access this Navision database through the Navision client on my PC.

When I try and configure the DSN it simply hangs.

I am passing the following info to the CODBC setup

Data Source: NAVCON
Description:
Program Folder:
Connection: Server
Server Name: myNavServer
Net Type: TCP
Database Name:
Company: (When I Browse for the company I get prompted for the username and password, it is at this point that nothing happens!!!)

I intend accessing Navision data through an ASP page however I cannot even create a simple CODBC connection. I have checked that the version of the CODBC driver is the same as the various program file versions and this is the case (CODBC.DLL 3.70.01.16172)

Any advice would be appreciated

LLoyd