Could Not Open A Connection To SQL Server

Nov 25, 2007

Hi,
 
Has somebody had a problem like this before?
Exception Details: System.Data.SqlClient.SqlException:
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 settings SQL Server does not allow remote
connections. (provider: Named Pipes Provider, error: 40 - Could not
open a connection to SQL Server)
That's part of the code:
        SqlConnection con;
        string sql;
        SqlCommand cmd;
      
        con=new SqlConnection("Data Source=elf/SQLEXPRESS;Initial Catalog=logos;Integrated Security=SSPI;");
        sql="SELECT max(id_kandydat) from Kandydat";
        con.Open();
        cmd=new SqlCommand(sql,con);
        int id = Convert.ToInt32(cmd.ExecuteScalar());

        con.Close();

        SqlDataSource7.InsertCommand="INSERT INTO Kandydat_na_Kierunek(id_kandydat, id_kierunku, id_stan) VALUES ("+"'"+id+"'"+","+"'"+DropDownList1.SelectedValue+"'"+","+'1'+");";
 
I don't really get it. I'm nearly 100% sure that before some changes in my project this had worked perfectly. Does anybody have any idea how to make it work again? I would be very grateful for any help. And, yesy, I know it is quite common error, but proposed solution found didn't help.
Regards,
N. 
 

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i m getting this exception
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Hi,

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Try
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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 settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: 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 settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)Source Error:




An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:



 [SqlException (0x80131904): 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 settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)]   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +735059   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188   System.Data.SqlClient.TdsParser.Connect(Boolean& useFailoverPartner, Boolean& failoverDemandDone, String host, String failoverPartner, String protocol, SqlInternalConnectionTds connHandler, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean aliasLookup) +820   System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +628   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +359   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66   System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496   System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82   System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105   System.Data.SqlClient.SqlConnection.Open() +111   System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +121   System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +137   System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) +83   System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +1770   System.Web.UI.WebControls.Repeater.GetData() +50   System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource) +232   System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e) +53   System.Web.UI.WebControls.Repeater.DataBind() +72   System.Web.UI.WebControls.Repeater.EnsureDataBound() +55   System.Web.UI.WebControls.Repeater.OnPreRender(EventArgs e) +12   System.Web.UI.Control.PreRenderRecursiveInternal() +77   System.Web.UI.Control.PreRenderRecursiveInternal() +161   System.Web.UI.Control.PreRenderRecursiveInternal() +161   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1360
 

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---------------------------
Microsoft Visual Studio
---------------------------
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Mei



---------------------------

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------------------------------

Cannot connect to .

------------------------------
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SQL SERVER LOG file:
2007-12-05 11:31:11.12 Server Microsoft SQL Server 2005 - 9.00.3042.00 (Intel X86)
Feb 9 2007 22:47:07
Copyright (c) 1988-2005 Microsoft Corporation
Express Edition on Windows NT 5.1 (Build 2600: Service Pack 2)

2007-12-05 11:31:11.12 Server Error: 17054, Severity: 16, State: 1.
2007-12-05 11:31:11.12 Server The current event was not reported to the Windows Events log. Operating system error = 1502(error not found). You may need to clear the Windows Events log if it is full.
2007-12-05 11:31:11.12 Server (c) 2005 Microsoft Corporation.
2007-12-05 11:31:11.12 Server All rights reserved.
2007-12-05 11:31:11.12 Server Server process ID is 1744.
2007-12-05 11:31:11.12 Server Authentication mode is MIXED.
2007-12-05 11:31:11.12 Server Logging SQL Server messages in file 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLLOGERRORLOG'.
2007-12-05 11:31:11.12 Server This instance of SQL Server last reported using a process ID of 4884 at 5.12.2007 11:30:09 (local) 5.12.2007 9:30:09 (UTC). This is an informational message only; no user action is required.
2007-12-05 11:31:11.12 Server Registry startup parameters:
2007-12-05 11:31:11.12 Server -d C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLDATAmaster.mdf
2007-12-05 11:31:11.12 Server -e C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLLOGERRORLOG
2007-12-05 11:31:11.12 Server -l C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLDATAmastlog.ldf
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Installed SQL Server 2005 Developer Edition on a machine with WinXP SP2 and enabled remote connections over TCP/IP
Installed SQL Server 2005 Standard Edition on a machine with Win2003 SP1 (remote connections over TCP/IP enabled by default)
Attempted to 'Copy Database' from Developer Edition TO Standard Edition using 'Detach and Attach' method and recieved the error on the Win2003 machine: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server
Attempted to 'Copy Database' from Developer Edition TO Standard Edition using 'SQL Management Objects' method and recieved the error on the Win2003 machine: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server
Reinstalled Standard Edition on the Win2003 SP1 machine
Checked all the settings on both machines several times, restarted services etc., and read every post I could find referencing the error.
Same error
Lost my last hair

Thanks in advance,

Steve

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Cannot Open Connection Dialog When Starting SQL Server Management Studio

Jul 18, 2007

I start SQL Server Management Studio on my workstation and get the following message.



TITLE: Microsoft SQL Server Management Studio
------------------------------

Failed to open connection dialog.

------------------------------
ADDITIONAL INFORMATION:

Could not load file or assembly 'SqlMgmt, Version=9.0.242.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) (mscorlib)

------------------------------
BUTTONS:

OK
------------------------------


I had SQl Express version installed previously and everything worked. I could connect to one server running SQL Express and a different server running full up SQL 2005 enterprise version.



I uninstalled All SQL express programs and installed tools from SQL 2005 developer.



I have rebooted, started the program directly (not using a link of any kind) and all attempts fail. After dismissing the error msg the tool opens and I can run queries agains the DB but the database engines and related tables do not show.



My work station is Windows XP with SP2 installed.



I have googled the problem extensively and tried solutions found but none have solved the problem.



Any help greatly appreciated.

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Named Pipes Provider, Error 40 - Could Not Open A Connection To SQL Server

Dec 5, 2007

My configuration is: Vista Home Premium, SQL Server Express and I'm trying to access a database on an instance named AxisSQLServer in a C# application.

As a result of a previous post (SQL Network Interface, error 28), I have selected "Local and Remote, using TCP/IP only" in the Surface Area Configuration for Services and Connections.

SQL Server is started.
SQL Server Browser is started.

Both programs have been added as exceptions to the firewall (don't understand why I would need to do this since everything is on the same box).

Have turned off McAfee AV.

My connection string reads:
string connectionString = "Data Source=localhost;" +
"Initial Catalog=AxisSQL;Integrated Security=SSPI";
where AxisSQL is the database I'm trying to read.

I have looked at and followed numerous forums and blogs and always get the same error.

Stan

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Named Pipes Provider: Could Not Open A Connection To SQL Server [53], But Only On The Remote, Not The Local

Jun 18, 2007

My connection string (to a remote instance of SQL Server Exress 2005) is exactly the same when the web files are located on my local machine or my remote machine, and while it works fine when I use the local web files, I get the following error when I use the remote files:

"Named Pipes Provider: Could not open a connection to SQL Server [53]"

As you can see, since it works from the local version, I've setup SQL to accept remote connections via TCP/IP and Named Pipes. I'm using IIS7 on the local, and IIS6 on the remote, in case that makes a difference. I have other sites setup the same way, which work fine.

Any thoughts?

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SqlCeConnection Failing To Open A Connection To The SQL Server 2005 Mobile Edition

Apr 15, 2008

Good day,

I am writing an application using VB.Net 2005 for the Windows CE 5.0 device and it is connecting to a SQL Server 2005 Mobile Edition Database.
The trouble I'm having is establishing a connection to a SQL Server Mobile database on the device.

Here is the code I am using:




Code Snippet
Public gConnectionString As String = "Data Source=Program FilesMobAppMobDB.sdf;Persist Security Info=False;"




Code Snippet

Imports System.Data.SqlServerCe

Public Class DBManager

Public Shared gSQLCEConnection As SqlCeConnection


Public Shared Function OpenDB() As Boolean

If gSQLCEConnection IsNot Nothing Then

Throw New InvalidOperationException("Connection already open.")
End If
gSQLCEConnection = New SqlCeConnection(gConnectionString)
Try

gSQLCEConnection.Open() 'Error occurs here
Return True
Catch ex As SqlCeException

MsgBox(ex.Message & vbCrLf & ex.HResult & vbCrLf & ex.NativeError & vbCrLf & ex.Source)
Return False
End Try
End Function


In the immediate window I recieve the following messages:


A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll

A first chance exception of type 'System.Data.SqlServerCe.SqlCeException' occurred in System.Data.SqlServerCe.dll


I believe that the first few lines are caused by the icons/pictures that I have included with my app, but the SqlCeException line occurs when the connection to the .SDF file is trying to be established.

Here is the exception output:

Message: "" (Blank)
HResult: -2147024882
NativeError: 0
Source: SQL Server 2005 Mobile Edition ADO.NET Data Provider

Programs under Remove Programs on the PDA are:
Microsoft .NET CF 2.0 ENU-String R...
Microsoft .NET Compact Framework...
Microsoft SQL Client
Microsoft SQL Mobile 2005
Microsoft SQL Mobile 2005 [EN]
Microsoft SQL Server 2005 Compact...
Microsoft SQL Server 2005 Compact...
Microsoft SQL Server 2005 Compact...
Microsoft SQLCE 2.0
Microsoft SQLCE 2.0 Dev

Any ideas on what could be stopping this connection from being established? It was working before but all of a sudden just stopped. I have warm booted, cold booted, and rebuilt with no luck and also checked that SQL Query Analyzer is not running on the PDA and that the connection string is valid.
The call to OpenDB occurs in the form_load of the startup object.

Thanks in advance,

Leon

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ExecuteReader Requires An Open And Available Connection. The Connection's Current State Is Closed.

Apr 26, 2007

I am accessing SQL2005 with C# code using OleDbConnection.



A try and catch block catches the following error once a while between the Open() and Close() of the connection:

ExecuteNonQuery requires an open and available Connection. The connection's current state is closed.



I do not even have any idea where to start to debug this. The ExecuteNonQuery() runs a delete SQL query. It works 99.9% of the time. I do not see anything wrong when this error happens.



Any hint would be greatly appreciated.



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