Trouble connecting to remote db using the .NET data provider for Sql Server

I am working with a database on another system via a ssh tunnel using
plink. We have setup an alias the local system for the remote database.

I am able to connect and work from within Visual Studio if I connect to

the remote database using with "SQL Server" as the data source and
".NET Framework Data Provider for OLEDB" as the data provider . If I
change the data provider to ".NET Framework Data Provider for SQL
Server" I get the following error:

"An error has occurred while establishing a connection to the server.
When connecting to SQL Server 2005, this failure may be caused by the
fact that under the default setting SQL Server does not allow remote
connects. (provider: TCP Provider, error: 0 - No connection could be
made because the target machine actively refused it.)"


What do I need to do to fix this?


All help is appreciated.


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Local system:
Windows 2000 Professional,
SQL Server 2005 Standard
Visual Studio 2005 Standard
.NET Framework 2.0 (1.1 not installed)


Remote system:
SQL Server 2000