Error"Failed to open the connection"  - Named Instance of SQL Server 2005

"Failed to open the connection" error, when connecting to the Named Instance of SQL Server 2005
The report is throwing error, when changing the logon information dynamically through C#.
     string reportPath = @"D:\NET\TestReport\TestReport.rpt";
     ReportDocument reportDocument = new ReportDocument();
     foreach(CrystalDecisions.CrystalReports.Engine.Table table in tables)
          TableLogOnInfo tableLogonInfo = table.LogOnInfo;                         
          tableLogonInfo.ConnectionInfo.ServerName = @"TestServer\Instance1";  //Connnecting to Named instance of SQL Server 2005
          tableLogonInfo.ConnectionInfo.UserID = "sa";
          tableLogonInfo.ConnectionInfo.Password = "password";
          tableLogonInfo.ConnectionInfo.DatabaseName = "TEST_DB";
     crystalReportViewer1.ReportSource = reportDocument;
Error Message
     Failed to open the connection.
     Failed to open the connection.
The error is occuring only whenever i am connecting to the Named Instance of SQL Server 2005.
Thanks in Advance
Edited by: pugalendran p on Feb 2, 2009 10:32 AM
Edited by: pugalendran p on Feb 2, 2009 10:43 AM

Following solution might help you to resolve the issue.
Issue happens because universe connection to the Database is not responding and the Data Source Name is not configured to write SQL Server 2005 database.
Created new DSN connection under SYSTEM DSN to SQL Server 2005 Database.
Import the universe from the designer.
Go to File->Parameters.
Edit Connection.
On the Database Middleware Page expand SQl Server 2005->Select SQL Server 2005 driver.
Change the DSN to new DSN connection
Test the connection.
Save the Universe and Export it to the repository.
I am taking Oracle as an example over here.
This can be caused when the SQLNET.ora is located in a remote location using mapped drives.
To resolve,
check the registry [HKLM\SOFTWARE\ORACLE] you should see a folder called HOME0
look for any paths that contain a mapped drive partition
Change the mapped drive letter to a UNC path (
Open a command prompt and do a tnsping using the tnsname and verify the location of the SQLNET.ora or TNSNAMES.ora
If the path is not updated to the new path
Reboot the server
Sarbhjeet Kaur

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