Problem remoting to SQL Server from a Vista Machine

[BillG]

I have a C# .net app that connects remotely to a SQL Server 2005 database on
a Windows 2003 server machine sitting in Chicago. It connects through a
VPN. Everything works fine when I run the app from a machine running XP Pro
SP 2. When I try to run the same app, no modifications, from a Vista
Business machine and from a Vista Ultimate machine, (so I am assuming it's a
Vista issue) I get the error

[DBNETLIB] ConnectionOpen (Connect()).] SQL Server does not exist or assess
denied.

It is not the SQL Server, because it works from the XP machine.
It is not TCP/IP on the Vista machines because I can do everything else,
connnect to internet, connect through VPN etc.

As it is happening on more than one machine running Vista and not the XP,
that is why I am assuming it is a Vista Problem.

I can connect to the SQL Server on the Chicago machine by using SQL Server
Management Studio Express.

That seems to narrow it down to a ado.net issue.

I am using the .net 3.5 framework.

Any suggestions?

BillG

 

[BillG]

I solved the problem. When connecting from a Vista machine change the
configuration string to use the ip address, port number of the SQL Server
machine instead of the name of the SQL Server machine.

Bill