A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or could not be accessed.

Production environment:

Operating system: Windows Server 2003

Database system: SQL Server 2005

Program Operating Environment: Iis+asp.net

The runtime error is as follows:

Line 227:// Determine database connection status Line 228:IF (Conn. State = ConnectionState.Open) Line 229:conn. Open (); Line : Line 231:cmd. Connection = conn;

source File : F:\SenateHome\App_Code\SqlHelper.cs Line : 229
Stack Trace :

[SqlException (0x80131904):in withSQL ServerA network-related or instance-specific error occurred while establishing the connection. The server was not found or could not be accessed. Please verify that the instance name is correct andSQL Serveris configured to allow remote connections. (provider:Named pipe provider, error:40-cannot open toSQL Serverthe connection)] System.Data.ProviderBase.DbConnectionPool.GetConnection (DbConnection owningobject) +428 System.Data.ProviderBase.DbConnectionFactory.GetConnection (DbConnection owningconnection) +65 System.Data.ProviderBase.DbConnectionClosed.OpenConnection (DbConnection outerconnection, dbconnectionfactory ConnectionFactory) +117 System.Data.SqlClient.SqlConnection.Open (+122) Sqlhelper.preparecommand (SqlCommand cmd, SqlConnection conn, SqlTransaction Trans, CommandType cmdtype, String Cmdtext, Sqlparameter[] cmdparms) in f:\senatehome\app_code\sqlhelper.cs:229 Sqlhelper.executereader (String connectionString, CommandType cmdtype, String cmdtext, sqlparameter[] Commandparameters) in f:\senatehome\app_code\sqlhelper.cs:128 _default.display () in f:\senatehome\index.aspx.cs:30 _default.page_load (Object sender, EventArgs e) in f:\senatehome\index.aspx.cs:24 System.Web.Util.CalliHelper.EventArgFunctionCaller (IntPtr FP, object o, Object T, EventArgs e) +14 System.Web.Util.CalliEventHandlerDelegateProxy.Callback (Object sender, EventArgs e) +35 System.Web.UI.Control.OnLoad (EventArgs e) +99 System.Web.UI.Control.LoadRecursive (+50) System.Web.UI.Page.ProcessRequestMain (Boolean includestagesbeforeasyncpoint, Boolean includestagesafterasyncpoint ) +627

  version information :  microsoft. NET Framework :2.0.50727.3053; ASP. NET version :2.0.50727.3053

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A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or could not be accessed.