Bizzare SQL Network Error

I am trying to connect to a default instance of SQL Server 2000 Enterprise on
a remote network server using ADO.NET objects through ASP.NET Web Application.

The SQL SERVER is on a Windows XP machine (no firewall enabled) with TCP/IP
and Named Pipes enabled

For the test purposes, I created a new Web Form, created a new SqlConnection
in the Server Explorer to the remote database. I test the connection is VS
IDE and everything is fine. I create a SqlDataAdapter on the web form,
generate a dataset, test the dataset and the results are valid. I bind the
SqlDataAdapter to a datagrid and run the webform. I now get the following
error.

System.Data.SqlClient.SqlException: SQL Server does not exist or access
denied.
at System.Data.SqlClient.ConnectionPool.GetConnection(Boolean&
isInTransaction)
at
System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction)
at System.Data.SqlClient.SqlConnection.Open()
at DBConnTest.WebForm1.Page_Load(Object sender, EventArgs e) in
c:\inetpub\wwwroot\dbconntest\webform1.aspx.cs:line 39

Hmph! I take the same connection string from the web app, create a win app.
Place a datagrid on the form, do the binding and load the app. Hey Presto! it
works.

I used TCPView (systeminternals.com) and I can see aspnet_wp trying to
create a connection, but its at though SQL Server is rejecting the
connection, although I see no failures in SQL Server.

Any thoughts would be much appreciated.

Andy
.

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